Armin Braun 619e4f8c02
Make BackgroundIndexer more Efficient (#57781) (#57789)
Improve efficiency of background indexer by allowing to add
an assertion for failures while they are produced to prevent
queuing them up.
Also, add non-blocking stop to the background indexer so that when
stopping multiple indexers we don't needlessly continue indexing
on some indexers while stopping another one.

Closes #57766
2020-06-08 10:18:47 +02:00
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