Elasticsearch 8.15.x has been tested and added to the compatibility matrix to the corresponding Liferay versions.
Note: Compatibility with newer Elasticsearch minor versions is tested in two ways:
Latest-Latest: Testing the latest Liferay version with the latest available minor version of Elasticsearch → e.g.
Master/2024.Q3 + Elasticsearch 8.15
Minimum-Latest: Testing the minimum Liferay version where Elasticsearch 8 compatibility was first made available with the latest minor version of Elasticsearch →
DXP 7.4 U81/DXP 7.3 U31 + Elasticsearch 8.15
This way Liferay can allow a broader deployment base to operate their stack with an up-to-date search engine version.
As Elasticsearch is usually releases a new Minor version roughly every two months, this is a recurring process and a planed activity in each quarter.