[9.1] Use local segment fieldInfos to lookup tsdb merge stats (#132597) #132612
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Merging shrink TSDB or LogsDB indices can fail in versions 8.19 or 9.1+. When shrinking an index to a single shard, we use addIndexes, which can add Lucene segments directly. In this case, FieldInfos can differ between shards and the new segment. We should use the FieldInfos from each segment to retrieve the merge stats, instead of the FieldInfos of the merged segment. Relates elastic#125403
dnhatn
added
:StorageEngine/Codec
>bug
auto-merge-without-approval
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Backports the following commits to 9.1: