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Fielddata: Remove soft/resident caches. #7443
These caches have no advantage compared to the default node cache. Additionally,
LongFieldDataBenchmark has been removed because the refactoring exposed a
I'm +1 for removing these caches on 1.x as well. I think we should mark this issue as breaking?
Also if someone has an index that is configured to use either soft or resident cache, then after upgrading this indices will fail to load? (maybe not immediately but after close and open or when a shard gets moved to an node that didn't have this index before) So maybe we should still support these settings, but under the hood we will be using the nodes field data cache?