elasticsearch connector unable to connect to cluster due to proxy dependency

In the current build (8.0.0-alpha2), I see no implementation that uses Drupal's HTTP proxy settings. This version of Elasticsearch Connector uses elasticsearch/elasticsearch 8, which should support proxies through the ClientBuilder's setHttpClientOptions() method, as described here: https://www.elastic.co/guide/en/elasticsearch/client/php-api/8.15/http-client.html.

Is it correct to say that proxy support is missing from this module?

Changing the version number

@murrow, you're correct there's currently no support for proxy connection.

@sokru, I have updated the issue summary with a proposed solution. The dependency injection part will disturb the code a bit, but I don't think the other tasks will have much impact. What are your thoughts?

Further update to the summary problem section

Adding test task