Clean up request/response for get-cluster-settings #86347
Merged
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Today there are request and response objects for the
get-cluster-settings action but the request is unused and the response
is only used in the REST layer. This commit removes the unused request
and renames the response to reflect that it's not a transport-layer
response. It also tidies a few things up in this area, removing the
unused
ActionResponse
superclass, making its fields final, andreplacing the overly-general
RestBuilderListener
with a regularRestToXContentListener
in the REST action.Relates #82342 because to resolve that issue we will want to introduce
transport-layer request/response classes, and the classes involved in
this commit are in the way of that change.