#23349)

The IndexShardOperationsLock has a mechanism to delay operations if there is currently a block on the lock. These
delayed operations are executed when the block is released and are executed by a different thread. When the different
thread executes the operations, the ThreadContext is that of the thread that was blocking operations. In order to
preserve the ThreadContext, we need to store it and wrap the listener when the operation is delayed.

#23349)

The IndexShardOperationsLock has a mechanism to delay operations if there is currently a block on the lock. These
delayed operations are executed when the block is released and are executed by a different thread. When the different
thread executes the operations, the ThreadContext is that of the thread that was blocking operations. In order to
preserve the ThreadContext, we need to store it and wrap the listener when the operation is delayed.

#23349)

The IndexShardOperationsLock has a mechanism to delay operations if there is currently a block on the lock. These
delayed operations are executed when the block is released and are executed by a different thread. When the different
thread executes the operations, the ThreadContext is that of the thread that was blocking operations. In order to
preserve the ThreadContext, we need to store it and wrap the listener when the operation is delayed.

* master: (26 commits)
  CLI: Fix prompting for yes/no to handle console returning null (elastic#23320)
  Tests: Fix reproduce line for packagingTest (elastic#23365)
  Build: Remove extra copies of netty license (elastic#23361)
  [TEST] Removes timeout based wait_for_active_shards REST test (elastic#23360)
  [TEST] increase timeout slightly in wait_for_active_shards test to allow for index creation cluster state update to be processed before ensuring the wait times out
  Handle snapshot repository's missing index.latest
  Adding equals/hashCode to MainResponse (elastic#23352)
  Always restore the ThreadContext for operations delayed due to a block (elastic#23349)
  Add support for named xcontent parsers to high level REST client (elastic#23328)
  Add unit tests for ParentToChildAggregator (elastic#23305)
  Fix after last merge with master and apply last comments
  [INGEST] Lazy load the geoip databases.
  disable BWC tests for the highlighters, need a new 5.x build to make it work
  Expose WordDelimiterGraphTokenFilter (elastic#23327)
  Test that buildCredentials returns correct clazz (elastic#23334)
  Add BreakIteratorBoundaryScanner support for FVH (elastic#23248)
  Prioritize listing index-N blobs over index.latest in reading snapshots (elastic#23333)
  Test: Fix hdfs test fixture setup on windows
  delete and index tests can share some part of the code
  Remove createSampleDocument method and use the sync'ed index method
  ...

The ThreadedActionListener may not be invoked by the same thread that creates it. When this happens, the ThreadContext
from the thread that created the ThreadedActionListener should be used. This change makes the ThreadedActionListener
always wrap the ActionListener in a ContextPreservingActionListener to prevent accidental loss of the ThreadContext.

Relates elastic#23349