* Add selector syntax to index expressions (#118614)
This PR introduces a new syntactical feature to index expression resolution: The selector.
Selectors, denoted with a :: followed by a recognized suffix will allow users to specify which component of
an index abstraction they would like to operate on within an API call. In this case, an index abstraction is a
concrete index, data stream, or alias; Any abstraction that can be resolved to a set of indices/shards. We
define a component of an index abstraction to be some searchable unit of the index abstraction.
(cherry picked from commit c3839e1f76)
# Conflicts:
# modules/data-streams/src/internalClusterTest/java/org/elasticsearch/datastreams/IngestFailureStoreMetricsIT.java
# server/src/main/java/org/elasticsearch/TransportVersions.java
# server/src/test/java/org/elasticsearch/action/OriginalIndicesTests.java
* [CI] Auto commit changes from spotless
* Fixing compiler issues
* Remove feature flag from influencing the serialisation
* Only add failure indices when failure store flag is on
* Fix OriginalIndicesTests
* [CI] Auto commit changes from spotless
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Co-authored-by: elasticsearchmachine <infra-root+elasticsearchmachine@elastic.co>
Co-authored-by: Felix Barnsteiner <felixbarny@users.noreply.github.com>
Co-authored-by: Mary Gouseti <mary.gouseti@elastic.co>
Co-authored-by: Mary Gouseti <mgouseti@gmail.com>
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