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

* 6.x:
  Add get stored script and delete stored script to high level REST API
  Increasing skip version for failing test on 6.x
  Skip get_alias tests for 5.x (#31397)
  Fix defaults in GeoShapeFieldMapper output (#31302)
  Test: better error message on failure
  Mute DefaultShardsIT#testDefaultShards test
  Fix reference to XContentBuilder.string() (#31337)
  [DOCS] Adds monitoring breaking change (#31369)
  [DOCS] Adds security breaking change (#31375)
  [DOCS] Backports breaking change (#31373)
  RestAPI: Reject forcemerge requests with a body (#30792)
  Docs: Use the default distribution to test docs (#31251)
  Use system context for cluster state update tasks (#31241)
  [DOCS] Adds testing for security APIs (#31345)
  [DOCS] Removes ML item from release highlights
  [DOCS] Removes breaking change (#31376)
  REST high-level client: add validate query API (#31077)
  Move language analyzers from server to analysis-common module. (#31300)
  Expose lucene's RemoveDuplicatesTokenFilter (#31275)
  [Test] Fix :example-plugins:rest-handler on Windows
  Delete typos in SAML docs (#31199)
  Ensure we don't use a remote profile if cluster name matches (#31331)
  Test: Skip alias tests that failed all weekend
  [DOCS] Fix version in SQL JDBC Maven template
  [DOCS] Improve install and setup section for SQL JDBC
  Add ingest-attachment support for per document `indexed_chars` limit (#31352)
  SQL: Fix rest endpoint names in node stats (#31371)
  [DOCS] Fixes small issue in release notes
  Support for remote path in reindex api Closes #22913
  [ML] Put ML filter API response should contain the filter (#31362)
  Remove trial status info from start trial doc (#31365)
  [DOCS] Added links in breaking changes pages
  [DOCS] Adds links to release notes and highlights
  Docs: Document changes in rest client
  QA: Fix tribe tests to use node selector
  REST Client: NodeSelector for node attributes (#31296)
  LLClient: Fix assertion on windows
  LLClient: Support host selection (#30523)
  Add QA project and fixture based test for discovery-ec2 plugin (#31107)
  [ML] Hold ML filter items in sorted set (#31338)
  [ML] Add description to ML filters (#31330)

* master:
  Add get stored script and delete stored script to high level REST API - post backport fix
  Add get stored script and delete stored script to high level REST API (#31355)
  Core: Combine Action and GenericAction (#31405)
  Fix reference to XContentBuilder.string() (#31337)
  Avoid sending duplicate remote failed shard requests (#31313)
  Fix defaults in GeoShapeFieldMapper output (#31302)
  RestAPI: Reject forcemerge requests with a body (#30792)
  Packaging: Remove windows bin files from the tar distribution (#30596)
  Docs: Use the default distribution to test docs (#31251)
  [DOCS] Adds testing for security APIs (#31345)
  Clarify that IP range data can be specified in CIDR notation. (#31374)
  Use system context for cluster state update tasks (#31241)
  Percentile/Ranks should return null instead of NaN when empty (#30460)
  REST high-level client: add validate query API (#31077)
  Move language analyzers from server to analysis-common module. (#31300)
  [Test] Fix :example-plugins:rest-handler on Windows
  Expose lucene's RemoveDuplicatesTokenFilter (#31275)
  Reload secure settings for plugins (#31383)
  Remove some cases in FieldTypeLookupTests that are no longer relevant. (#31381)
  Ensure we don't use a remote profile if cluster name matches (#31331)
  [TEST] Double write alias fault (#30942)
  [DOCS] Fix version in SQL JDBC Maven template
  [DOCS] Improve install and setup section for SQL JDBC
  SQL: Fix rest endpoint names in node stats (#31371)
  Support for remote path in reindex api - post backport fix Closes #22913
  [ML] Put ML filter API response should contain the filter (#31362)
  Support for remote path in reindex api (#31290)
  Add byte array pooling to nio http transport (#31349)
  Remove trial status info from start trial doc (#31365)
  [DOCS] Adds links to release notes and highlights
  add is-write-index flag to aliases (#30942)
  Add rollover-creation-date setting to rolled over index (#31144)
  [ML] Hold ML filter items in sorted set (#31338)
  [Tests] Fix edge case in ScriptedMetricAggregatorTests (#31357)

Since elastic#31251, we use the default distribution to test docs. With this
distribution, the cat thread-pool response will include the ccr
thread-pool. This commit adjusts /_cat/thread_pool doc to include ccr.

Relates elastic#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

Since #31251, we use the default distribution to test docs. With this
distribution, the cat thread-pool response will include the ccr
thread-pool. This commit adjusts /_cat/thread_pool doc to include ccr.

Relates #31251

Since #31251, we use the default distribution to test docs. With this
distribution, the cat thread-pool response will include the ccr
thread-pool. This commit adjusts /_cat/thread_pool doc to include ccr.

Relates #31251