Docs: Use the default distribution to test docs (#31251)

This switches the docs tests from the `oss-zip` distribution to the
`zip` distribution so they have xpack installed and configured with the
default basic license. The goal is to be able to merge the
`x-pack/docs` directory into the `docs` directory, marking the x-pack
docs with some kind of marker. This is the first step in that process.

This also enables `-Dtests.distribution` support for the `docs`
directory so you can run the tests against the `oss-zip` distribution
with something like
```
./gradlew -p docs check -Dtests.distribution=oss-zip
```

We can set up Jenkins to run both.

Relates to #30665

buildSrc/src/main/groovy/org/elasticsearch/gradle/doc/DocsTestPlugin.groovy

@@ -32,6 +32,8 @@ public class DocsTestPlugin extends RestTestPlugin {
     public void apply(Project project) {
         project.pluginManager.apply('elasticsearch.standalone-rest-test')
         super.apply(project)
+        // The distribution can be configured with -Dtests.distribution on the command line
+        project.integTestCluster.distribution = System.getProperty('tests.distribution', 'zip')
         // Docs are published separately so no need to assemble
         project.tasks.remove(project.assemble)
         project.build.dependsOn.remove('assemble')
@@ -43,6 +45,8 @@ public class DocsTestPlugin extends RestTestPlugin {
             '\\{version\\}':
                 VersionProperties.elasticsearch.toString().replace('-SNAPSHOT', ''),
             '\\{lucene_version\\}' : VersionProperties.lucene.replaceAll('-snapshot-\\w+$', ''),
+            '\\{build_flavor\\}' :
+                project.integTestCluster.distribution.startsWith('oss-') ? 'oss' : 'default',
         ]
         Task listSnippets = project.tasks.create('listSnippets', SnippetsTask)
         listSnippets.group 'Docs'

docs/Versions.asciidoc

@@ -5,6 +5,7 @@
 :branch:                6.3
 :jdk:                   1.8.0_131
 :jdk_major:             8
+:build_flavor:          default
 
 //////////
 release-state can be: released | prerelease | unreleased

docs/build.gradle

@@ -20,7 +20,6 @@
 apply plugin: 'elasticsearch.docs-test'
 
 integTestCluster {
-  distribution = 'oss-zip'
   /* Enable regexes in painless so our tests don't complain about example
    * snippets that use them. */
   setting 'script.painless.regex.enabled', 'true'

docs/plugins/discovery-azure-classic.asciidoc

@@ -372,7 +372,7 @@ This command should give you a JSON result:
   "cluster_uuid" : "AT69_T_DTp-1qgIJlatQqA",
   "version" : {
     "number" : "{version}",
-    "build_flavor" : "oss",
+    "build_flavor" : "{build_flavor}",
     "build_type" : "zip",
     "build_hash" : "f27399d",
     "build_date" : "2016-03-30T09:51:41.449Z",

docs/reference/cat/nodeattrs.asciidoc

@@ -9,15 +9,23 @@ For example:
 GET /_cat/nodeattrs?v
 --------------------------------------------------
 // CONSOLE
+// TEST[s/\?v/\?v&s=node,attr/]
+// Sort the resulting attributes so we can assert on them more easilly
 
 Could look like:
 
 [source,txt]
 --------------------------------------------------
 node    host      ip        attr     value
-EK_AsJb 127.0.0.1 127.0.0.1 testattr test
+...
+node-0 127.0.0.1 127.0.0.1 testattr test
+...
 --------------------------------------------------
-// TESTRESPONSE[s/EK_AsJb/.+/ _cat]
+// TESTRESPONSE[s/\.\.\.\n$/\n(.+ xpack\\.installed true\n)?\n/]
+// TESTRESPONSE[s/\.\.\.\n/(.+ ml\\..+\n)*/ _cat]
+// If xpack is not installed then neither ... with match anything
+// If xpack is installed then the first ... contains ml attributes
+// and the second contains xpack.installed=true
 
 The first few columns (`node`, `host`, `ip`) give you basic info per node
 and the `attr` and `value` columns give you the custom node attributes,
@@ -46,15 +54,24 @@ mode (`v`). The header name will match the supplied value (e.g.,
 GET /_cat/nodeattrs?v&h=name,pid,attr,value
 --------------------------------------------------
 // CONSOLE
+// TEST[s/,value/,value&s=node,attr/]
+// Sort the resulting attributes so we can assert on them more easilly
 
 Might look like:
 
 [source,txt]
 --------------------------------------------------
 name    pid   attr     value
-EK_AsJb 19566 testattr test
+...
+node-0 19566 testattr test
+...
 --------------------------------------------------
-// TESTRESPONSE[s/EK_AsJb/.+/ s/19566/\\d*/ _cat]
+// TESTRESPONSE[s/19566/\\d*/]
+// TESTRESPONSE[s/\.\.\.\n$/\n(.+ xpack\\.installed true\n)?\n/]
+// TESTRESPONSE[s/\.\.\.\n/(.+ ml\\..+\n)*/ _cat]
+// If xpack is not installed then neither ... with match anything
+// If xpack is installed then the first ... contains ml attributes
+// and the second contains xpack.installed=true
 
 [cols="<,<,<,<,<",options="header",subs="normal"]
 |=======================================================================

docs/reference/cat/templates.asciidoc

@@ -8,9 +8,16 @@ The `templates` command provides information about existing templates.
 GET /_cat/templates?v&s=name
 --------------------------------------------------
 // CONSOLE
+// TEST[s/templates/templates\/template*/]
 // TEST[s/^/PUT _template\/template0\n{"index_patterns": "te*", "order": 0}\n/]
 // TEST[s/^/PUT _template\/template1\n{"index_patterns": "tea*", "order": 1}\n/]
 // TEST[s/^/PUT _template\/template2\n{"index_patterns": "teak*", "order": 2, "version": 7}\n/]
+// The substitions do two things:
+// 1. Filter the response to just templates matching the te* pattern
+//    so that we only get the templates we expect regardless of which
+//    templates exist. If xpack is installed there will be unexpected
+//    templates.
+// 2. Create some templates to expect in the response.
 
 which looks like
 

docs/reference/cat/thread_pool.asciidoc

@@ -18,19 +18,19 @@ node-0 analyze             0 0 0
 node-0 fetch_shard_started 0 0 0
 node-0 fetch_shard_store   0 0 0
 node-0 flush               0 0 0
-node-0 force_merge         0 0 0
-node-0 generic             0 0 0
-node-0 get                 0 0 0
-node-0 index               0 0 0
-node-0 listener            0 0 0
-node-0 management          1 0 0
-node-0 refresh             0 0 0
-node-0 search              0 0 0
-node-0 snapshot            0 0 0
-node-0 warmer              0 0 0
+...
 node-0 write               0 0 0
 --------------------------------------------------
+// TESTRESPONSE[s/\.\.\./(node-0 .+ 0 0 0\n)+/]
 // TESTRESPONSE[s/\d+/\\d+/ _cat]
+// The substitutions do two things:
+// 1. Expect any number of extra thread pools. This allows us to only list a
+//    few thread pools. The list would be super long otherwise. In addition,
+//    if xpack is installed then the list will contain more thread pools and
+//    this way we don't have to assert about them.
+// 2. Expect any number of active, queued, or rejected items. We really don't
+//    know how many there will be and we just want to assert that there are
+//    numbers in the response, not *which* numbers are there.
 
 The first column is the node name
 
@@ -54,10 +54,16 @@ get
 index
 listener
 management
+ml_autodetect (default distro only)
+ml_datafeed (default distro only)
+ml_utility (default distro only)
 refresh
+rollup_indexing (default distro only)`
 search
+security-token-key (default distro only)
 snapshot
 warmer
+watcher (default distro only)
 write
 --------------------------------------------------
 

docs/reference/cluster/nodes-info.asciidoc

@@ -142,7 +142,7 @@ The result will look similar to:
       "host": "node-0.elastic.co",
       "ip": "192.168.17",
       "version": "{version}",
-      "build_flavor": "oss",
+      "build_flavor": "{build_flavor}",
       "build_type": "zip",
       "build_hash": "587409e",
       "roles": [
@@ -237,7 +237,7 @@ The result will look similar to:
       "host": "node-0.elastic.co",
       "ip": "192.168.17",
       "version": "{version}",
-      "build_flavor": "oss",
+      "build_flavor": "{build_flavor}",
       "build_type": "zip",
       "build_hash": "587409e",
       "roles": [],

docs/reference/cluster/stats.asciidoc

@@ -192,23 +192,23 @@ Will return, for example:
           "description": "Ingest processor that extracts information from a user agent",
           "classname": "org.elasticsearch.ingest.useragent.IngestUserAgentPlugin",
           "has_native_controller": false
-        }
+        },
+        ...
       ],
-      "network_types" : {
-         "transport_types" : {
-            "netty4" : 1
-         },
-         "http_types" : {
-            "netty4" : 1
-         }
-      }
+      ...
    }
 }
 --------------------------------------------------
 // TESTRESPONSE[s/"plugins": \[[^\]]*\]/"plugins": $body.$_path/]
+// TESTRESPONSE[s/\.\.\./"network_types": "replace_me"/]
 // TESTRESPONSE[s/: (\-)?[0-9]+/: $body.$_path/]
 // TESTRESPONSE[s/: "[^"]*"/: $body.$_path/]
-////
-The TESTRESPONSE above replace all the fields values by the expected ones in the test,
-because we don't really care about the field values but we want to check the fields names.
-////
+// These replacements do a few things:
+// 1. Ignore the contents of the `plugins` object because we don't know all of
+//    the plugins that will be in it. And because we figure folks don't need to
+//    see an exhaustive list anyway.
+// 2. The last ... contains more things that we don't think are important to
+//    include in the output.
+// 3. All of the numbers and strings on the right hand side of *every* field in
+//    the response are ignored. So we're really only asserting things about the
+//    the shape of this response, not the values in it.

docs/reference/setup/install/check-running.asciidoc

@@ -19,7 +19,7 @@ which should give you a response something like this:
   "cluster_uuid" : "AT69_T_DTp-1qgIJlatQqA",
   "version" : {
     "number" : "{version}",
-    "build_flavor" : "oss",
+    "build_flavor" : "{build_flavor}",
     "build_type" : "zip",
     "build_hash" : "f27399d",
     "build_date" : "2016-03-30T09:51:41.449Z",