[7.x] Change DELETE to POST for _bulk_delete to avoid incompatibility issues (#87914) #88509
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elastic#87914) ## Summary Changes `DELETE` to `POST` for _bulk_delete on the client only for a variety of reasons. According to the RFC, not all servers and proxies need to honor DELETE having a body. From: https://tools.ietf.org/html/rfc7231 ``` A payload within a DELETE request message has no defined semantics; sending a payload body on a DELETE request might cause some existing implementations to reject the request. ``` Within at least one proxy, h2o2, we have found that it does indeed change request headers which will cause NodeJS to not attach the body of a `DELETE`: hapijs/h2o2#124 Also from other communities such as OpenAPI where they debated this, they allow it but discourage it for reasons outlined there that I will not repeat here: OAI/OpenAPI-Specification#1937 Elastic Search API's and other Kibana API's use `POST` rather than `DELETE` for their bodies that are attached to `DELETE`: https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-delete-by-query.html We still support bodies in `DELETE` and `POST` but are just changing the web client to utilize `POST` moving forward. ### Checklist Reviewed and we already have unit tests and end to end tests for these use cases so we are good with just updating them. - [x] [Unit or functional tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html) were updated or added to match the most common scenarios
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Backports the following commits to 7.x: