firestore_client.cc: increase the kRegularBackfillDelay from 1ms to 1000ms #10170
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Fix CPU thrashing from the index backfiller, which was being scheduled for execution every 1ms. The fix in this PR is to increase the scheduling period to 1000ms.
This also works around an intermittent crash on Firestore's shutdown, which cause the integration tests in the firebase-cpp-sdk to crash.
This bug was introduced in 9.5.0 by #10021.
Googlers see b/244656664 for details.
Fixes #10168