Update dependency elasticsearch to v9

This MR contains the following updates:

Package	Update	Change
elasticsearch (source, changelog)	major	8.18.0 -> 9.0.2

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Release Notes

elastic/elasticsearch-ruby (elasticsearch)

v9.0.2

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• Udpates setting 'Accept' and 'Content-Type' headers as to not duplicate or overwrite user set headers #​2666.

v9.0.1

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• The request headers were updated for Elasticsearch v9: compatible-with=9 #​2660.

v9.0.0

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Ruby 3.2 and up are tested and supported for 9.0. Older versions of Ruby have reached their end of life. We follow Ruby’s own maintenance policy and officially support all currently maintained versions per Ruby Maintenance Branches. The required Ruby version is set to 2.6 to keep compatiblity wit JRuby 9.3. However, we only test the code against currently supported Ruby versions.

Gem

The size of both elasticsearch and elasticsearch-api gems is smaller than in previous versions. Some unnecessary files that were being included in the gem have now been removed. There has also been a lot of old code cleanup for the 9.x branch.

Elasticsearch Serverless

With the release of 9.0, the Elasticsearch Serverless client has been discontinued. You can use this client to build your Elasticsearch Serverless Ruby applications. The Elasticsearch Serverless API is fully supported. The CI build for Elasticsearch Ruby runs tests to ensure compatibility with Elasticsearch Serverless.

Elasticsearch API

• The source code is now generated from elasticsearch-specification, so the API documentation is much more detailed and extensive. The value Elasticsearch::ES_SPECIFICATION_COMMIT is updated with the commit hash of elasticsearch-specification in which the code is based every time it's generated.
• The API code has been updated for compatibility with Elasticsearch API v 9.0.
• indices.get_field_mapping - :fields is a required parameter.
• knn_search - This API has been removed. It was only ever experimental and was deprecated in v8.4. It isn't supported in 9.0, and only works when the header compatible-with=8 is set. The search API should be used for all knn queries.
• The functions in utils.rb that had names starting with double underscore have been renamed to remove these (e.g. __listify to listify).
• Namespaces clean up: The API namespaces are now generated dynamically based on the elasticsearch-specification. As such, some deprecated namespace files have been removed from the codebase:
  • The rollup namespace was removed. The rollup feature was never GA-ed, it has been deprecated since 8.11.0 in favor of downsampling.
  • The data_frame_deprecated, remote namespace files have been removed, no APIs were available.
  • The shutdown namespace was removed. It is designed for indirect use by ECE/ESS and ECK. Direct use is not supported.

Scroll APIs need to send scroll_id in request body

Sending the scroll_id as a parameter has been deprecated since version 7.0.0. It needs to be specified in the request body for clear_scroll and scroll.

Impact

Client code using clear_scroll or scroll APIs and the deprecated scroll_id as a parameter needs to be updated.

Action

If you are using the clear_scroll or scroll APIs, and sending the scroll_id as a parameter, you need to update your code to send the scroll_id as part of the request body:

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