OnlineIndexer "Lessening limit..." log does not include requested mdc

[ScottDugas]

If the OnlineIndexer is built with an mdcContext, the log entries: "Lessening limit of online index build" are run in a thread that does not have the requested mdcContext restored.

More broadly, the following blocks of code do not have the mdcContext set:

• https://github.com/FoundationDB/fdb-record-layer/blob/2.5.44.0/fdb-record-layer-core/src/main/java/com/apple/foundationdb/record/provider/foundationdb/OnlineIndexer.java#L250
• https://github.com/FoundationDB/fdb-record-layer/blob/2.5.44.0/fdb-record-layer-core/src/main/java/com/apple/foundationdb/record/provider/foundationdb/OnlineIndexer.java#L253
• https://github.com/FoundationDB/fdb-record-layer/blob/2.5.44.0/fdb-record-layer-core/src/main/java/com/apple/foundationdb/record/provider/foundationdb/OnlineIndexer.java#L263
• https://github.com/FoundationDB/fdb-record-layer/blob/2.5.44.0/fdb-record-layer-core/src/main/java/com/apple/foundationdb/record/provider/foundationdb/FDBDatabaseRunner.java#L356
• https://github.com/FoundationDB/fdb-record-layer/blob/2.5.44.0/fdb-record-layer-core/src/main/java/com/apple/foundationdb/record/provider/foundationdb/FDBDatabaseRunner.java#L360

[ScottDugas]

This also applies to general usage of FDBDatabaseRunner.runAsync.

[ScottDugas]

Also, note that other blocks of code do restore the mdcContext, specifically FDBDatabaseRunner.RunRetriable.handle() will pick up the mdcContext from the record context.