Reuse previous indices lookup when possible #79804
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Backporting elastic#79004 to 7.x branch. In cases when indices, aliases and data streams aren't modified then the indices lookup can be reused. For example in: * The IndexMetadataUpdater#applyChanges(...) method builds a new metadata instance, but only primary term or insync allocations may be updated. No new indices, aliases or data streams are added, so re-building indices lookup is not necessary. * MasterService#patchVersions Additionally the logic that checks when indices lookup can be reused, this logic also checks the hidden and system flags of indices/datastreams. In clusters with many indices the cost of building indices lookup is non-neglectable and should be avoided in this case. Closes elastic#78980 Partially addresses elastic#77888
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Backporting #79004 to 7.16 branch.
In cases when indices, aliases and data streams aren't modified then
the indices lookup can be reused.
For example in:
instance, but only primary term or insync allocations may be updated.
No new indices, aliases or data streams are added, so re-building indices
lookup is not necessary.
Additionally the logic that checks when indices lookup can be reused,
this logic also checks the hidden and system flags of indices/datastreams.
In clusters with many indices the cost of building indices lookup is
non-neglectable and should be avoided in this case.
Closes #78980
Partially addresses #77888