boundary: use ES API-stable LSIB#createThreadPool

[yaauie]

Introduced on Elasticsearch main in elastic/elasticsearch#105163 and backported to 8.12 in elastic/elasticsearch#105163. Migrating to this stable API allows our build to work across the 8.12->8.13 boundary in which we observed a change to the ThreadPool's constructor.

Resolves: elastic/logstash-filter-elastic_integration#120

Closes: #121

[elasticmachine]

:yellow_heart: Build succeeded, but was flaky

• Buildkite Build
• Commit: 08f905a79b96ec82694928f6be7d71c311e63499

Failed CI Steps

• :hammer: CI setup and unit tests run :docker:
• :hammer: CI setup and integration tests with ES 8.x-SNAPSHOT run on :docker:

History

[mashhurs]

Can we version bump and release new version?

[yaauie]

Can we version bump and release new version?

This is so far an internal-only change so I see no reason to release a new version until we have something that is user-facing.