release-23.1:Backport!7307

Merged Andrey Vertiprahov requested to merge cherry-pick-709a4819 into release-23.1

Add ReadPreference to check fallen objects on discovery.

See merge request !7307 (merged)

(cherry picked from commit 709a4819)

4460c952 Add ReadPreference to check fallen objects on discovery. 3e3a0d78 Add index to Escalations collection. d800df96 Fix black.

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