Add AliasesRequest interface to mark requests that manage aliases #9460
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We currently have the IndicesRequest interface to mark indices related requests and be able to retrieve the indices they relate to in a generic way. This commit introduces a similar abstraction for requests that manage aliases, to be able to retrieve/replace the aliases they relate to.
Also, IndicesAliasesRequest becomes a CompositeIndicesRequest, as it allows to perform multiple operations (e.g. add/remote multiple aliases). Each single operation (AliasActions) implements now the newly introduced AliasesRequest.
AliasesRequest is also implemented by GetAliasesRequest, which allows to retrieve aliases information.