[8.0] Fix FLS for frozen tier (#82521)#82565
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ywelsch merged 1 commit intoelastic:8.0from Jan 14, 2022
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Field level security was interacting in bad ways with the can-match phase on frozen tier shards (interaction between FieldSubsetReader and RewriteCachingDirectoryReader). This made can-match phase fail, which in the normal case would result in extra load on the frozen tier, and in the extreme case (in interaction with elastic#51708) made searches fail. This is a bug that was indirectly introduced by elastic#78988. Closes elastic#82044
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Backports the following commits to 8.0: