Add 2.9.0 release note #539

Job	Run time
Run Gradle Check on neural-search Plugin (11, ubuntu-latest)	2m 17s
Run Gradle Check on neural-search Plugin (11, ubuntu-latest)	2m 17s
Run Gradle Check on neural-search Plugin (11, windows-latest)	2m 8s
Run Gradle Check on neural-search Plugin (11, windows-latest)	2m 8s
Run Gradle Check on neural-search Plugin (17, ubuntu-latest)	2m 2s
Run Gradle Check on neural-search Plugin (17, ubuntu-latest)	2m 3s
Run Gradle Check on neural-search Plugin (17, windows-latest)	2m 7s
Run Gradle Check on neural-search Plugin (17, windows-latest)	2m 7s
Pre-commit neural-search Plugin (11, ubuntu-latest)	1m 14s
Pre-commit neural-search Plugin (11, ubuntu-latest)	1m 14s
Pre-commit neural-search Plugin (11, windows-latest)	2m 3s
Pre-commit neural-search Plugin (11, windows-latest)	2m 3s
Pre-commit neural-search Plugin (17, ubuntu-latest)	1m 37s
Pre-commit neural-search Plugin (17, ubuntu-latest)	1m 37s
Pre-commit neural-search Plugin (17, windows-latest)	1m 50s
Pre-commit neural-search Plugin (17, windows-latest)	1m 50s
	30m 37s

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