Refactor IndexAbstraction to not use IndexMetadata #79246
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Backport of elastic#79080 to 7.x branch. Most users of an `IndexAbstraction` instance doesn't need to use the `IndexMetadata` instances that `getIndices()` and `getWriteIndex()` returns. Cluster state variables/parameters can be used in places that access to `IndexMetadata` is required. By changing the `getIndices()` and `getWriteIndex()` methods to return `Index` instance, the indices lookup can be reused across different cluster states. This should be possible in cases that don't change an index hidden status or open and closes indices or when adding / removing aliases, data streams or indices. This change should allow for elastic#79004
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Backport of #79080 to 7.x branch.
Most users of an
IndexAbstractioninstance doesn't need to use theIndexMetadatainstances thatgetIndices()andgetWriteIndex()returns.Cluster state variables/parameters can be used in places that access to
IndexMetadatais required.By changing the
getIndices()andgetWriteIndex()methods to returnIndexinstance, the indices lookup can be reused across different cluster states.
This should be possible in cases that don't change an index hidden status or
open and closes indices or when adding / removing aliases, data streams or indices.
This change should allow for #79004