Simplify dynamic mappings updates. #10720
Merged
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While dynamic mappings updates are using the same code path as updates from the
API when applied on a data node since #10593, they were still using a different
code path on the master node. This commit makes dynamic updates processed the
same way as updates from the API, which also seems to do a better way at
acknowledgements (I could not reproduce the ConcurrentDynamicTemplateTests
failure anymore). It also adds more checks, like for instance that indexing on
replicas should not trigger dynamic mapping updates since they should have been
handled on the primary before.