[ML] Use a new annotations index for future annotations #79460
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Due to historical bugs a non-negligible proportion of ML users have an annotations index with incorrect mappings. We have published instructions on how to correct the mappings, but the procedure is complicated, and some users prefer to tolerate the lack of annotations functionality rather than attempt the operations necessary to fix the mappings of the existing index. The best way to solve the problem is to create a new annotations index with the correct mappings, and use this for all annotations created from that moment on. This PR implements that solution. The annotations read alias will span the old and new indices in the case where both exist. The annotations write index is adjusted to point only at the new index. Adds back elastic#79006, which was reverted because Kibana was not ready.
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Due to historical bugs a non-negligible proportion of
ML users have an annotations index with incorrect mappings.
We have published instructions on how to correct the
mappings, but the procedure is complicated, and some users
prefer to tolerate the lack of annotations functionality
rather than attempt the operations necessary to fix the
mappings of the existing index.
The best way to solve the problem is to create a new
annotations index with the correct mappings, and use this
for all annotations created from that moment on. This PR
implements that solution. The annotations read alias will
span the old and new indices in the case where both exist.
The annotations write index is adjusted to point only at
the new index.
Adds back #79006, which was reverted because Kibana was
not ready.