[8.x] Introduce allow_partial_results setting in ES|QL (#122890) #124152
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This change introduces a cluster setting `esql.query.allow_partial_results` that allows enabling or disabling allow_partial_results in ES|QL at the cluster-wide level. Initially, this setting defaults to false, but it will be switched to true soon. The reason for not changing the default in this PR is that it requires adjusting many tests, which would make the PR too large. Instead, we will adjust the tests incrementally and switch the default when the tests are ready. This cluster setting is useful for falling back to the previous behavior (i.e., disabling allow_partial_results) if users upgrade to the new version and haven't updated their queries. Also, the default setting can be overridden on a per-request basis via a URL parameter (allow_partial_results) (changed from request body to URL parameter to conform to the proposal). Relates elastic#122802
dnhatn
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:Analytics/ES|QL
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Backports the following commits to 8.x: