Add GetRollupCaps API to high level rest client

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

@@ -993,3 +993,4 @@ private static String encodePart(String pathPart) {
         }
     }
 }
+

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

@@ -20,6 +20,8 @@
 package org.elasticsearch.client;
 
 import org.elasticsearch.action.ActionListener;
+import org.elasticsearch.client.rollup.GetRollupCapsRequest;
+import org.elasticsearch.client.rollup.GetRollupCapsResponse;
 import org.elasticsearch.client.rollup.PutRollupJobRequest;
 import org.elasticsearch.client.rollup.PutRollupJobResponse;
 
@@ -73,4 +75,35 @@ public void putRollupJobAsync(PutRollupJobRequest request, RequestOptions option
             PutRollupJobResponse::fromXContent,
             listener, Collections.emptySet());
     }
+
+    /**
+     * Get the Rollup Capabilities of a target (non-rollup) index or pattern
+     * See <a href="https://www.elastic.co/guide/en/elasticsearch/reference/master/rollup-get-rollup-caps.html">
+     * the docs</a> 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 GetRollupCapsResponse getRollupCapabilities(GetRollupCapsRequest request, RequestOptions options) throws IOException {
+        return restHighLevelClient.performRequestAndParseEntity(request,
+            RollupRequestConverters::getRollupCaps,
+            options,
+            GetRollupCapsResponse::fromXContent,
+            Collections.emptySet());
+    }
+
+    /**
+     * Asynchronously put a rollup job into the cluster
+     * See <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/rollup-put-job.html">
+     * the docs</a> 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 getRollupCapabilitiesAsync(GetRollupCapsRequest request, RequestOptions options,
+                                           ActionListener<GetRollupCapsResponse> listener) {
+        restHighLevelClient.performRequestAsyncAndParseEntity(request, RollupRequestConverters::getRollupCaps, options,
+            GetRollupCapsResponse::fromXContent, listener, Collections.emptySet());
+    }
 }

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

@@ -18,7 +18,9 @@
  */
 package org.elasticsearch.client;
 
+import org.apache.http.client.methods.HttpGet;
 import org.apache.http.client.methods.HttpPut;
+import org.elasticsearch.client.rollup.GetRollupCapsRequest;
 import org.elasticsearch.client.rollup.PutRollupJobRequest;
 
 import java.io.IOException;
@@ -42,4 +44,16 @@ static Request putJob(final PutRollupJobRequest putRollupJobRequest) throws IOEx
         request.setEntity(createEntity(putRollupJobRequest, REQUEST_BODY_CONTENT_TYPE));
         return request;
     }
+
+    static Request getRollupCaps(GetRollupCapsRequest getRollupCapsRequest) throws IOException {
+        String endpoint = new RequestConverters.EndpointBuilder()
+            .addPathPartAsIs("_xpack")
+            .addPathPartAsIs("rollup")
+            .addPathPartAsIs("data")
+            .addPathPart(getRollupCapsRequest.getIndexPattern())
+            .build();
+        Request request = new Request(HttpGet.METHOD_NAME, endpoint);
+        request.setEntity(createEntity(getRollupCapsRequest, REQUEST_BODY_CONTENT_TYPE));
+        return request;
+    }
 }

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

@@ -0,0 +1,77 @@
+/*
+ * 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.rollup;
+
+import org.elasticsearch.client.Validatable;
+import org.elasticsearch.client.ValidationException;
+import org.elasticsearch.cluster.metadata.MetaData;
+import org.elasticsearch.common.Strings;
+import org.elasticsearch.common.xcontent.ToXContentObject;
+import org.elasticsearch.common.xcontent.XContentBuilder;
+
+import java.io.IOException;
+import java.util.Objects;
+import java.util.Optional;
+
+public class GetRollupCapsRequest implements Validatable, ToXContentObject {
+    private String indexPattern;
+    private static final String ID = "id";
+
+    public GetRollupCapsRequest(String indexPattern) {
+        if (Strings.isNullOrEmpty(indexPattern) || indexPattern.equals("*")) {
+            this.indexPattern = MetaData.ALL;
+        } else {
+            this.indexPattern = indexPattern;
+        }
+    }
+
+    public String getIndexPattern() {
+        return indexPattern;
+    }
+
+    @Override
+    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
+        builder.startObject();
+        builder.field(ID, indexPattern);
+        builder.endObject();
+        return builder;
+    }
+
+    @Override
+    public Optional<ValidationException> validate() {
+        return Optional.empty();
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(indexPattern);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        GetRollupCapsRequest other = (GetRollupCapsRequest) obj;
+        return Objects.equals(indexPattern, other.indexPattern);
+    }
+}

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

@@ -0,0 +1,92 @@
+/*
+ * 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.rollup;
+
+import org.elasticsearch.common.Strings;
+import org.elasticsearch.common.xcontent.ToXContent;
+import org.elasticsearch.common.xcontent.ToXContentObject;
+import org.elasticsearch.common.xcontent.XContentBuilder;
+import org.elasticsearch.common.xcontent.XContentParser;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+
+public class GetRollupCapsResponse implements ToXContentObject {
+
+    private Map<String, RollableIndexCaps> jobs = Collections.emptyMap();
+
+    public GetRollupCapsResponse(Map<String, RollableIndexCaps> jobs) {
+        this.jobs = Collections.unmodifiableMap(Objects.requireNonNull(jobs));
+    }
+
+    public Map<String, RollableIndexCaps> getJobs() {
+        return jobs;
+    }
+
+    @Override
+    public XContentBuilder toXContent(XContentBuilder builder, ToXContent.Params params) throws IOException {
+        builder.startObject();
+        for (Map.Entry<String, RollableIndexCaps> entry : jobs.entrySet()) {
+            entry.getValue().toXContent(builder, params);
+        }
+        builder.endObject();
+        return builder;
+    }
+
+    public static GetRollupCapsResponse fromXContent(final XContentParser parser) throws IOException {
+        Map<String, RollableIndexCaps> jobs = new HashMap<>();
+        XContentParser.Token token = parser.nextToken();
+        if (token.equals(XContentParser.Token.START_OBJECT)) {
+            while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
+                if (token.equals(XContentParser.Token.FIELD_NAME)) {
+                    String pattern = parser.currentName();
+
+                    RollableIndexCaps cap = RollableIndexCaps.PARSER.apply(pattern).apply(parser, null);
+                    jobs.put(pattern, cap);
+                }
+            }
+        }
+        return new GetRollupCapsResponse(jobs);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(jobs);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        GetRollupCapsResponse other = (GetRollupCapsResponse) obj;
+        return Objects.equals(jobs, other.jobs);
+    }
+
+    @Override
+    public final String toString() {
+        return Strings.toString(this);
+    }
+}

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

@@ -0,0 +1,100 @@
+/*
+ * 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.rollup;
+
+import org.elasticsearch.common.ParseField;
+import org.elasticsearch.common.xcontent.ConstructingObjectParser;
+import org.elasticsearch.common.xcontent.ToXContentFragment;
+import org.elasticsearch.common.xcontent.XContentBuilder;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Objects;
+import java.util.function.Function;
+
+/**
+ * Represents the rollup capabilities of a non-rollup index.  E.g. what values/aggregations
+ * were rolled up for this index, in what rollup jobs that data is stored and where those
+ * concrete rollup indices exist
+ *
+ * The index name can either be a single index, or an index pattern (logstash-*)
+ */
+public class RollableIndexCaps implements ToXContentFragment {
+    private static final ParseField ROLLUP_JOBS = new ParseField("rollup_jobs");
+
+    public static final Function<String, ConstructingObjectParser<RollableIndexCaps, Void>> PARSER = indexName -> {
+        @SuppressWarnings("unchecked")
+        ConstructingObjectParser<RollableIndexCaps, Void> p
+            = new ConstructingObjectParser<>(indexName,
+            a -> new RollableIndexCaps(indexName, (List<RollupJobCaps>) a[0]));
+
+        p.declareObjectArray(ConstructingObjectParser.constructorArg(), RollupJobCaps.PARSER::apply,
+            ROLLUP_JOBS);
+        return p;
+    };
+
+    private String indexName;
+    private List<RollupJobCaps> jobCaps;
+
+    public RollableIndexCaps(String indexName, List<RollupJobCaps> caps) {
+        this.indexName = indexName;
+        this.jobCaps = Objects.requireNonNull(caps);
+        this.jobCaps.sort(Comparator.comparing(RollupJobCaps::getJobID));
+        this.jobCaps = Collections.unmodifiableList(jobCaps);
+    }
+
+    public String getIndexName() {
+        return indexName;
+    }
+
+    public List<RollupJobCaps> getJobCaps() {
+        return jobCaps;
+    }
+
+    @Override
+    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
+        builder.startObject(indexName);
+        builder.field(ROLLUP_JOBS.getPreferredName(), jobCaps);
+        builder.endObject();
+        return builder;
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (this == other) {
+            return true;
+        }
+
+        if (other == null || getClass() != other.getClass()) {
+            return false;
+        }
+
+        RollableIndexCaps that = (RollableIndexCaps) other;
+
+        return Objects.deepEquals(this.jobCaps, that.jobCaps)
+            && Objects.equals(this.indexName, that.indexName);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(jobCaps, indexName);
+    }
+}