We need to stash thread context in DefaultRestChannel before we call channel.sendResponse because when calling this method, our execution might be delayed and the thread be reused for another task - like sending another response. And it would see thread context from the initial “delayed” work.

This commit also expands the assertions on the empty thread context to make sure it does not contains response headers.

closes elastic#68278

We need to stash thread context in DefaultRestChannel before we call
channel.sendResponse because when calling this method, our execution
might be delayed and the thread be reused for another task - like
sending another response.
And it would see thread context from the initial “delayed” work.

This commit also expands the assertions on the empty thread context
to make sure it does not contains response headers.

closes elastic#68278

…) (#85865)

We need to stash thread context in DefaultRestChannel before we call
channel.sendResponse because when calling this method, our execution
might be delayed and the thread be reused for another task - like
sending another response.
And it would see thread context from the initial “delayed” work.

This commit also expands the assertions on the empty thread context
to make sure it does not contains response headers.

closes #68278

…) (#85860)

We need to stash thread context in DefaultRestChannel before we call
channel.sendResponse because when calling this method, our execution
might be delayed and the thread be reused for another task - like
sending another response.
And it would see thread context from the initial “delayed” work.

This commit also expands the assertions on the empty thread context
to make sure it does not contains response headers.

closes #68278

…n/elasticsearch into datastream-reuse-pipeline-source

* 'datastream-reuse-pipeline-source' of github.com:weizijun/elasticsearch: (28 commits)
  Add JDK 19 to Java testing matrix
  [ML] add nlp config update serialization tests (elastic#85867)
  [ML] A text categorization aggregation that works like ML categorization (elastic#80867)
  [ML] Fix serialisation of text embedding updates (elastic#85863)
  TSDB: fix wrong initial value of tsidOrd in TimeSeriesIndexSearcher (elastic#85713)
  Enforce external id uniqueness during DesiredNode construction (elastic#84227)
  Fix Intellij integration (elastic#85866)
  Upgrade Azure SDK to version 12.14.4 (elastic#83884)
  [discovery-gce] Fix initialisation of transport in FIPS mode (elastic#85817)
  Remove unnecessary docs/changelog/85534.yaml
  Prevent ThreadContext header leak when sending response (elastic#68649)
  Add support for impact_areas to health impacts  (elastic#85830)
  Reduce port range re-use in tests (elastic#85777)
  Fix TranslogTests#testStats (elastic#85828)
  Remove hppc from cat allocation api (elastic#85842)
  Fix BuildTests serialization (elastic#85827)
  Use urgent priority for node shutdown cluster state update (elastic#85838)
  Remove Task classes from HLRC (elastic#85835)
  Remove unused migration classes (elastic#85834)
  Remove uses of Charset name parsing (elastic#85795)
  ...