The elasticsearch fork just got its first long-term support release. opensearch 3.6 and 2.19, out…
the elasticsearch fork just got its first long-term support release. opensearch 3.6 and 2.19, out september 18, are the first lts versions since the 2021 split and add 32x vector compression for agent workloads.
the fork stopped being a moving target.
Context
The OpenSearch Software Foundation's announcement of 16 April 2026, from OpenSearchCon Europe in Prague, announces a long-term support program and calls OpenSearch 3.6 the first designated LTS release, with vendor support from BigData Boutique, Eliatra and Resolve Technology. The OpenSearch 3.6 introduction post, listed April 7, 2026, describes 1-bit scalar quantization with Faiss as the default for 32x compression.
The first-party text shows the LTS program announced April 16, so out september 18 is not supported by what was read. No source was found on 2.19 being designated LTS, on a September 18 event, or on the claim of the first LTS since the 2021 split, and the support window was not found. The 32x is vector storage compression from quantization and not a throughput figure, and for agent workloads is the author's framing. The fork stopped being a moving target is the author's take.
Watch next
- The LTS maintenance policy and the 2.19 status on the releases page.
Sources
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 22 September 2026 at 21:36 IST. Sources are the papers and datasets the note draws on.
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