Add Snapshot Lifecycle Management (elastic#43934)

* Add SnapshotLifecycleService and related CRUD APIs

This commit adds `SnapshotLifecycleService` as a new service under the ilm
plugin. This service handles snapshot lifecycle policies by scheduling based on
the policies defined schedule.

This also includes the get, put, and delete APIs for these policies

Relates to elastic#38461

* Make scheduledJobIds return an immutable set

* Use Object.equals for SnapshotLifecyclePolicy

* Remove unneeded TODO

* Implement ToXContentFragment on SnapshotLifecyclePolicyItem

* Copy contents of the scheduledJobIds

* Handle snapshot lifecycle policy updates and deletions (elastic#40062)

(Note this is a PR against the `snapshot-lifecycle-management` feature branch)

This adds logic to `SnapshotLifecycleService` to handle updates and deletes for
snapshot policies. Policies with incremented versions have the old policy
cancelled and the new one scheduled. Deleted policies have their schedules
cancelled when they are no longer present in the cluster state metadata.

Relates to elastic#38461

* Take a snapshot for the policy when the SLM policy is triggered (elastic#40383)

(This is a PR for the `snapshot-lifecycle-management` branch)

This commit fills in `SnapshotLifecycleTask` to actually perform the
snapshotting when the policy is triggered. Currently there is no handling of the
results (other than logging) as that will be added in subsequent work.

This also adds unit tests and an integration test that schedules a policy and
ensures that a snapshot is correctly taken.

Relates to elastic#38461

* Record most recent snapshot policy success/failure (elastic#40619)

Keeping a record of the results of the successes and failures will aid
troubleshooting of policies and make users more confident that their
snapshots are being taken as expected.

This is the first step toward writing history in a more permanent
fashion.

* Validate snapshot lifecycle policies (elastic#40654)

(This is a PR against the `snapshot-lifecycle-management` branch)

With the commit, we now validate the content of snapshot lifecycle policies when
the policy is being created or updated. This checks for the validity of the id,
name, schedule, and repository. Additionally, cluster state is checked to ensure
that the repository exists prior to the lifecycle being added to the cluster
state.

Part of elastic#38461

* Hook SLM into ILM's start and stop APIs (elastic#40871)

(This pull request is for the `snapshot-lifecycle-management` branch)

This change allows the existing `/_ilm/stop` and `/_ilm/start` APIs to also
manage snapshot lifecycle scheduling. When ILM is stopped all scheduled jobs are
cancelled.

Relates to elastic#38461

* Add tests for SnapshotLifecyclePolicyItem (elastic#40912)

Adds serialization tests for SnapshotLifecyclePolicyItem.

* Fix improper import in build.gradle after master merge

* Add human readable version of modified date for snapshot lifecycle policy (elastic#41035)

* Add human readable version of modified date for snapshot lifecycle policy

This small change changes it from:

```
...
"modified_date": 1554843903242,
...
```

To

```
...
"modified_date" : "2019-04-09T21:05:03.242Z",
"modified_date_millis" : 1554843903242,
...
```

Including the `"modified_date"` field when the `?human` field is used.

Relates to elastic#38461

* Fix test

* Add API to execute SLM policy on demand (elastic#41038)

This commit adds the ability to perform a snapshot on demand for a policy. This
can be useful to take a snapshot immediately prior to performing some sort of
maintenance.

```json
PUT /_ilm/snapshot/<policy>/_execute
```

And it returns the response with the generated snapshot name:

```json
{
  "snapshot_name" : "production-snap-2019.04.09-rfyv3j9qreixkdbnfuw0ug"
}
```

Note that this does not allow waiting for the snapshot, and the snapshot could
still fail. It *does* record this information into the cluster state similar to
a regularly trigged SLM job.

Relates to elastic#38461

* Add next_execution to SLM policy metadata (elastic#41221)

* Add next_execution to SLM policy metadata

This adds the next time a snapshot lifecycle policy will be executed when
retriving a policy's metadata, for example:

```json
GET /_ilm/snapshot?human
{
  "production" : {
    "version" : 1,
    "modified_date" : "2019-04-15T21:16:21.865Z",
    "modified_date_millis" : 1555362981865,
    "policy" : {
      "name" : "<production-snap-{now/d}>",
      "schedule" : "*/30 * * * * ?",
      "repository" : "repo",
      "config" : {
        "indices" : [
          "foo-*",
          "important"
        ],
        "ignore_unavailable" : true,
        "include_global_state" : false
      }
    },
    "next_execution" : "2019-04-15T21:16:30.000Z",
    "next_execution_millis" : 1555362990000
  },
  "other" : {
    "version" : 1,
    "modified_date" : "2019-04-15T21:12:19.959Z",
    "modified_date_millis" : 1555362739959,
    "policy" : {
      "name" : "<other-snap-{now/d}>",
      "schedule" : "0 30 2 * * ?",
      "repository" : "repo",
      "config" : {
        "indices" : [
          "other"
        ],
        "ignore_unavailable" : false,
        "include_global_state" : true
      }
    },
    "next_execution" : "2019-04-16T02:30:00.000Z",
    "next_execution_millis" : 1555381800000
  }
}
```

Relates to elastic#38461

* Fix and enhance tests

* Figured out how to Cron

* Change SLM endpoint from /_ilm/* to /_slm/* (elastic#41320)

This commit changes the endpoint for snapshot lifecycle management from:

```
GET /_ilm/snapshot/<policy>
```

to:

```
GET /_slm/policy/<policy>
```

It mimics the ILM path only using `slm` instead of `ilm`.

Relates to elastic#38461

* Add initial documentation for SLM (elastic#41510)

* Add initial documentation for SLM

This adds the initial documentation for snapshot lifecycle management.

It also includes the REST spec API json files since they're sort of
documentation.

Relates to elastic#38461

* Add `manage_slm` and `read_slm` roles (elastic#41607)

* Add `manage_slm` and `read_slm` roles

This adds two more built in roles -

`manage_slm` which has permission to perform any of the SLM actions, as well as
stopping, starting, and retrieving the operation status of ILM.

`read_slm` which has permission to retrieve snapshot lifecycle policies as well
as retrieving the operation status of ILM.

Relates to elastic#38461

* Add execute to the test

* Fix ilm -> slm typo in test

* Record SLM history into an index (elastic#41707)

It is useful to have a record of the actions that Snapshot Lifecycle
Management takes, especially for the purposes of alerting when a
snapshot fails or has not been taken successfully for a certain amount of
time.

This adds the infrastructure to record SLM actions into an index that
can be queried at leisure, along with a lifecycle policy so that this
history does not grow without bound.

Additionally,
SLM automatically setting up an index + lifecycle policy leads to
`index_lifecycle` custom metadata in the cluster state, which some of
the ML tests don't know how to deal with due to setting up custom
`NamedXContentRegistry`s.  Watcher would cause the same problem, but it
is already disabled (for the same reason).

* High Level Rest Client support for SLM (elastic#41767)

* High Level Rest Client support for SLM

This commit add HLRC support for SLM.

Relates to elastic#38461

* Fill out documentation tests with tags

* Add more callouts and asciidoc for HLRC

* Update javadoc links to real locations

* Add security test testing SLM cluster privileges (elastic#42678)

* Add security test testing SLM cluster privileges

This adds a test to `PermissionsIT` that uses the `manage_slm` and `read_slm`
cluster privileges.

Relates to elastic#38461

* Don't redefine vars

*  Add Getting Started Guide for SLM  (elastic#42878)

This commit adds a basic Getting Started Guide for SLM.

* Include SLM policy name in Snapshot metadata (elastic#43132)

Keep track of which SLM policy in the metadata field of the Snapshots
taken by SLM. This allows users to more easily understand where the
snapshot came from, and will enable future SLM features such as
retention policies.

* Fix compilation after master merge

* [TEST] Move exception wrapping for devious exception throwing

Fixes an issue where an exception was created from one line and thrown in another.

* Fix SLM for the change to AcknowledgedResponse

* Add Snapshot Lifecycle Management Package Docs (elastic#43535)

* Fix compilation for transport actions now that task is required

* Add a note mentioning the privileges needed for SLM (elastic#43708)

* Add a note mentioning the privileges needed for SLM

This adds a note to the top of the "getting started with SLM"
documentation mentioning that there are two built-in privileges to
assist with creating roles for SLM users and administrators.

Relates to elastic#38461

* Mention that you can create snapshots for indices you can't read

* Fix REST tests for new number of cluster privileges

* Mute testThatNonExistingTemplatesAreAddedImmediately (elastic#43951)

* Fix SnapshotHistoryStoreTests after merge

* Remove overridden newResponse functions that have been removed

client/rest-high-level/src/main/java/org/elasticsearch/client/IndexLifecycleClient.java

@@ -34,6 +34,12 @@
 import org.elasticsearch.client.indexlifecycle.RetryLifecyclePolicyRequest;
 import org.elasticsearch.client.indexlifecycle.StartILMRequest;
 import org.elasticsearch.client.indexlifecycle.StopILMRequest;
+import org.elasticsearch.client.snapshotlifecycle.DeleteSnapshotLifecyclePolicyRequest;
+import org.elasticsearch.client.snapshotlifecycle.ExecuteSnapshotLifecyclePolicyRequest;
+import org.elasticsearch.client.snapshotlifecycle.ExecuteSnapshotLifecyclePolicyResponse;
+import org.elasticsearch.client.snapshotlifecycle.GetSnapshotLifecyclePolicyRequest;
+import org.elasticsearch.client.snapshotlifecycle.GetSnapshotLifecyclePolicyResponse;
+import org.elasticsearch.client.snapshotlifecycle.PutSnapshotLifecyclePolicyRequest;
 
 import java.io.IOException;
 
@@ -300,4 +306,144 @@ public void retryLifecyclePolicyAsync(RetryLifecyclePolicyRequest request, Reque
         restHighLevelClient.performRequestAsyncAndParseEntity(request, IndexLifecycleRequestConverters::retryLifecycle, options,
             AcknowledgedResponse::fromXContent, listener, emptySet());
     }
+
+    /**
+     * Retrieve one or more snapshot lifecycle policy definitions.
+     * See <pre>
+     *  https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/
+     *  java-rest-high-ilm-slm-get-snapshot-lifecycle-policy.html
+     * </pre>
+     * for more.
+     * @param request the request
+     * @param options the request options (e.g. headers), use {@link RequestOptions#DEFAULT} if nothing needs to be customized
+     * @return the response
+     * @throws IOException in case there is a problem sending the request or parsing back the response
+     */
+    public GetSnapshotLifecyclePolicyResponse getSnapshotLifecyclePolicy(GetSnapshotLifecyclePolicyRequest request,
+                                                                         RequestOptions options) throws IOException {
+        return restHighLevelClient.performRequestAndParseEntity(request, IndexLifecycleRequestConverters::getSnapshotLifecyclePolicy,
+            options, GetSnapshotLifecyclePolicyResponse::fromXContent, emptySet());
+    }
+
+    /**
+     * Asynchronously retrieve one or more snapshot lifecycle policy definition.
+     * See <pre>
+     *  https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/
+     *  java-rest-high-ilm-slm-get-snapshot-lifecycle-policy.html
+     * </pre>
+     * for more.
+     * @param request the request
+     * @param options the request options (e.g. headers), use {@link RequestOptions#DEFAULT} if nothing needs to be customized
+     * @param listener the listener to be notified upon request completion
+     */
+    public void getSnapshotLifecyclePolicyAsync(GetSnapshotLifecyclePolicyRequest request, RequestOptions options,
+                                                ActionListener<GetSnapshotLifecyclePolicyResponse> listener) {
+        restHighLevelClient.performRequestAsyncAndParseEntity(request, IndexLifecycleRequestConverters::getSnapshotLifecyclePolicy,
+            options, GetSnapshotLifecyclePolicyResponse::fromXContent, listener, emptySet());
+    }
+
+    /**
+     * Create or modify a snapshot lifecycle definition.
+     * See <pre>
+     *  https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/
+     *  java-rest-high-ilm-slm-put-snapshot-lifecycle-policy.html
+     * </pre>
+     * for more.
+     * @param request the request
+     * @param options the request options (e.g. headers), use {@link RequestOptions#DEFAULT} if nothing needs to be customized
+     * @return the response
+     * @throws IOException in case there is a problem sending the request or parsing back the response
+     */
+    public AcknowledgedResponse putSnapshotLifecyclePolicy(PutSnapshotLifecyclePolicyRequest request,
+                                                           RequestOptions options) throws IOException {
+        return restHighLevelClient.performRequestAndParseEntity(request, IndexLifecycleRequestConverters::putSnapshotLifecyclePolicy,
+            options, AcknowledgedResponse::fromXContent, emptySet());
+    }
+
+    /**
+     * Asynchronously create or modify a snapshot lifecycle definition.
+     * See <pre>
+     *  https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/
+     *  java-rest-high-ilm-slm-put-snapshot-lifecycle-policy.html
+     * </pre>
+     * for more.
+     * @param request the request
+     * @param options the request options (e.g. headers), use {@link RequestOptions#DEFAULT} if nothing needs to be customized
+     * @param listener the listener to be notified upon request completion
+     */
+    public void putSnapshotLifecyclePolicyAsync(PutSnapshotLifecyclePolicyRequest request, RequestOptions options,
+                                                ActionListener<AcknowledgedResponse> listener) {
+        restHighLevelClient.performRequestAsyncAndParseEntity(request, IndexLifecycleRequestConverters::putSnapshotLifecyclePolicy,
+            options, AcknowledgedResponse::fromXContent, listener, emptySet());
+    }
+
+    /**
+     * Delete a snapshot lifecycle definition
+     * See <pre>
+     *  https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/
+     *  java-rest-high-ilm-slm-delete-snapshot-lifecycle-policy.html
+     * </pre>
+     * for more.
+     * @param request the request
+     * @param options the request options (e.g. headers), use {@link RequestOptions#DEFAULT} if nothing needs to be customized
+     * @return the response
+     * @throws IOException in case there is a problem sending the request or parsing back the response
+     */
+    public AcknowledgedResponse deleteSnapshotLifecyclePolicy(DeleteSnapshotLifecyclePolicyRequest request,
+                                                              RequestOptions options) throws IOException {
+        return restHighLevelClient.performRequestAndParseEntity(request, IndexLifecycleRequestConverters::deleteSnapshotLifecyclePolicy,
+            options, AcknowledgedResponse::fromXContent, emptySet());
+    }
+
+    /**
+     * Asynchronously delete a snapshot lifecycle definition
+     * See <pre>
+     *  https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/
+     *  java-rest-high-ilm-slm-delete-snapshot-lifecycle-policy.html
+     * </pre>
+     * for more.
+     * @param request the request
+     * @param options the request options (e.g. headers), use {@link RequestOptions#DEFAULT} if nothing needs to be customized
+     * @param listener the listener to be notified upon request completion
+     */
+    public void deleteSnapshotLifecyclePolicyAsync(DeleteSnapshotLifecyclePolicyRequest request, RequestOptions options,
+                                                   ActionListener<AcknowledgedResponse> listener) {
+        restHighLevelClient.performRequestAsyncAndParseEntity(request, IndexLifecycleRequestConverters::deleteSnapshotLifecyclePolicy,
+            options, AcknowledgedResponse::fromXContent, listener, emptySet());
+    }
+
+    /**
+     * Execute a snapshot lifecycle definition
+     * See <pre>
+     *  https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/
+     *  java-rest-high-ilm-slm-execute-snapshot-lifecycle-policy.html
+     * </pre>
+     * for more.
+     * @param request the request
+     * @param options the request options (e.g. headers), use {@link RequestOptions#DEFAULT} if nothing needs to be customized
+     * @return the response
+     * @throws IOException in case there is a problem sending the request or parsing back the response
+     */
+    public ExecuteSnapshotLifecyclePolicyResponse executeSnapshotLifecyclePolicy(ExecuteSnapshotLifecyclePolicyRequest request,
+                                                                                 RequestOptions options) throws IOException {
+        return restHighLevelClient.performRequestAndParseEntity(request, IndexLifecycleRequestConverters::executeSnapshotLifecyclePolicy,
+            options, ExecuteSnapshotLifecyclePolicyResponse::fromXContent, emptySet());
+    }
+
+    /**
+     * Asynchronously execute a snapshot lifecycle definition
+     * See <pre>
+     *  https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/
+     *  java-rest-high-ilm-slm-execute-snapshot-lifecycle-policy.html
+     * </pre>
+     * for more.
+     * @param request the request
+     * @param options the request options (e.g. headers), use {@link RequestOptions#DEFAULT} if nothing needs to be customized
+     * @param listener the listener to be notified upon request completion
+     */
+    public void executeSnapshotLifecyclePolicyAsync(ExecuteSnapshotLifecyclePolicyRequest request, RequestOptions options,
+                                                    ActionListener<ExecuteSnapshotLifecyclePolicyResponse> listener) {
+        restHighLevelClient.performRequestAsyncAndParseEntity(request, IndexLifecycleRequestConverters::executeSnapshotLifecyclePolicy,
+            options, ExecuteSnapshotLifecyclePolicyResponse::fromXContent, listener, emptySet());
+    }
 }

client/rest-high-level/src/main/java/org/elasticsearch/client/IndexLifecycleRequestConverters.java

@@ -32,6 +32,10 @@
 import org.elasticsearch.client.indexlifecycle.RetryLifecyclePolicyRequest;
 import org.elasticsearch.client.indexlifecycle.StartILMRequest;
 import org.elasticsearch.client.indexlifecycle.StopILMRequest;
+import org.elasticsearch.client.snapshotlifecycle.DeleteSnapshotLifecyclePolicyRequest;
+import org.elasticsearch.client.snapshotlifecycle.ExecuteSnapshotLifecyclePolicyRequest;
+import org.elasticsearch.client.snapshotlifecycle.GetSnapshotLifecyclePolicyRequest;
+import org.elasticsearch.client.snapshotlifecycle.PutSnapshotLifecyclePolicyRequest;
 import org.elasticsearch.common.Strings;
 
 import java.io.IOException;
@@ -159,4 +163,56 @@ static Request retryLifecycle(RetryLifecyclePolicyRequest retryLifecyclePolicyRe
         request.addParameters(params.asMap());
         return request;
     }
+
+    static Request getSnapshotLifecyclePolicy(GetSnapshotLifecyclePolicyRequest getSnapshotLifecyclePolicyRequest) {
+        String endpoint = new RequestConverters.EndpointBuilder().addPathPartAsIs("_slm/policy")
+            .addCommaSeparatedPathParts(getSnapshotLifecyclePolicyRequest.getPolicyIds()).build();
+        Request request = new Request(HttpGet.METHOD_NAME, endpoint);
+        RequestConverters.Params params = new RequestConverters.Params();
+        params.withMasterTimeout(getSnapshotLifecyclePolicyRequest.masterNodeTimeout());
+        params.withTimeout(getSnapshotLifecyclePolicyRequest.timeout());
+        request.addParameters(params.asMap());
+        return request;
+    }
+
+    static Request putSnapshotLifecyclePolicy(PutSnapshotLifecyclePolicyRequest putSnapshotLifecyclePolicyRequest) throws IOException {
+        String endpoint = new RequestConverters.EndpointBuilder()
+            .addPathPartAsIs("_slm/policy")
+            .addPathPartAsIs(putSnapshotLifecyclePolicyRequest.getPolicy().getId())
+            .build();
+        Request request = new Request(HttpPut.METHOD_NAME, endpoint);
+        RequestConverters.Params params = new RequestConverters.Params();
+        params.withMasterTimeout(putSnapshotLifecyclePolicyRequest.masterNodeTimeout());
+        params.withTimeout(putSnapshotLifecyclePolicyRequest.timeout());
+        request.addParameters(params.asMap());
+        request.setEntity(RequestConverters.createEntity(putSnapshotLifecyclePolicyRequest, RequestConverters.REQUEST_BODY_CONTENT_TYPE));
+        return request;
+    }
+
+    static Request deleteSnapshotLifecyclePolicy(DeleteSnapshotLifecyclePolicyRequest deleteSnapshotLifecyclePolicyRequest) {
+        Request request = new Request(HttpDelete.METHOD_NAME,
+            new RequestConverters.EndpointBuilder()
+                .addPathPartAsIs("_slm/policy")
+                .addPathPartAsIs(deleteSnapshotLifecyclePolicyRequest.getPolicyId())
+                .build());
+        RequestConverters.Params params = new RequestConverters.Params();
+        params.withMasterTimeout(deleteSnapshotLifecyclePolicyRequest.masterNodeTimeout());
+        params.withTimeout(deleteSnapshotLifecyclePolicyRequest.timeout());
+        request.addParameters(params.asMap());
+        return request;
+    }
+
+    static Request executeSnapshotLifecyclePolicy(ExecuteSnapshotLifecyclePolicyRequest executeSnapshotLifecyclePolicyRequest) {
+        Request request = new Request(HttpPut.METHOD_NAME,
+            new RequestConverters.EndpointBuilder()
+                .addPathPartAsIs("_slm/policy")
+                .addPathPartAsIs(executeSnapshotLifecyclePolicyRequest.getPolicyId())
+                .addPathPartAsIs("_execute")
+                .build());
+        RequestConverters.Params params = new RequestConverters.Params();
+        params.withMasterTimeout(executeSnapshotLifecyclePolicyRequest.masterNodeTimeout());
+        params.withTimeout(executeSnapshotLifecyclePolicyRequest.timeout());
+        request.addParameters(params.asMap());
+        return request;
+    }
 }

client/rest-high-level/src/main/java/org/elasticsearch/client/snapshotlifecycle/DeleteSnapshotLifecyclePolicyRequest.java

@@ -0,0 +1,49 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.client.snapshotlifecycle;
+
+import org.elasticsearch.client.TimedRequest;
+
+import java.util.Objects;
+
+public class DeleteSnapshotLifecyclePolicyRequest extends TimedRequest {
+    private final String policyId;
+
+    public DeleteSnapshotLifecyclePolicyRequest(String policyId) {
+        this.policyId = policyId;
+    }
+
+    public String getPolicyId() {
+        return this.policyId;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        DeleteSnapshotLifecyclePolicyRequest other = (DeleteSnapshotLifecyclePolicyRequest) o;
+        return this.policyId.equals(other.policyId);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.policyId);
+    }
+}

client/rest-high-level/src/main/java/org/elasticsearch/client/snapshotlifecycle/ExecuteSnapshotLifecyclePolicyRequest.java

@@ -0,0 +1,49 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.client.snapshotlifecycle;
+
+import org.elasticsearch.client.TimedRequest;
+
+import java.util.Objects;
+
+public class ExecuteSnapshotLifecyclePolicyRequest extends TimedRequest {
+    private final String policyId;
+
+    public ExecuteSnapshotLifecyclePolicyRequest(String policyId) {
+        this.policyId = policyId;
+    }
+
+    public String getPolicyId() {
+        return this.policyId;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        ExecuteSnapshotLifecyclePolicyRequest other = (ExecuteSnapshotLifecyclePolicyRequest) o;
+        return this.policyId.equals(other.policyId);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.policyId);
+    }
+}