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Remove core delete-by-query implementation #10859
This removes the core implementation of DBQ, which is trappy because it does an unexpected refresh every time and it can create inconsistent replicas since they can delete different documents from one another and the primary. See #10067 for details.
The plan is to create a separate "scan/scroll/delete" plugin for 2.0, which will do a scan/scroll query and then bulk-delete the IDs, for users who really need DBQ but can't implement it client side on upgrade.
I left DBQ in Translog / IndexShard / InternalEngine so that on upgrade if a DBQ is in the translog it can still be applied.
On backport to 1.x I'll just add back the deprecations in the docs and public APIs.