Allow indices lookup to be built lazily #78827
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Backport elastic#78745 to 7.x branch. Overloaded the Metadata.Builder.build() method by adding a parameter that controls when to build indices lookup. By default the indices lookup is always build. When cluster state updates are batched in ilm, then built the indices lookup lazily. Because during batching only the final cluster state is used, then for the many intermediate cluster states we avoids building the indices lookup, which in a cluster with many indices can improve the performance of publishing cluster states significantly. Relates to elastic#77466
martijnvg
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Backport #78745 to 7.x branch.
Overloaded the Metadata.Builder.build() method by adding a parameter that controls when to build indices lookup.
By default the indices lookup is always build.
When cluster state updates are batched in ilm, then built the indices lookup lazily. Because during batching only the final cluster state is used, then for the many intermediate cluster states we avoids building the indices lookup, which in a cluster with many indices can improve the performance of publishing cluster states significantly.
Relates to #77466