> For the complete documentation index, see [llms.txt](https://docs.appmixer.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.appmixer.com/changelog/version-6/6/6.5/6.5.3.md). # 6.5.3 2026-08-31 ## Bug Fixes * **Fixed every log query failing against an OpenSearch cluster** — On OpenSearch, all log reads returned HTTP 400 with *"The client noticed that the server is not Elasticsearch and we do not support this unknown product"*. From 7.14.0 onwards the Elasticsearch client performs a product check before its first request and then refuses to talk to a server that does not identify itself as Elasticsearch, so every request was rejected by the client itself before it ever reached the cluster. The client had been pinned below that version deliberately; a dependency sweep lifted the pin, which shipped in 6.5.0. It is pinned again, with the reason recorded next to it. This restores the log APIs, log deletion, flow insights, Automation Hub analytics, the Designer's example variables (which also feed AI Copilot) and the test-mode log fallback. Only deployments backed by OpenSearch were affected, and only on 6.5.0 through 6.5.2 — 6.4.11 and earlier are unaffected. A cluster that forbids anonymous `GET /` also masked the problem, because the client skips its product check when that request is rejected. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.appmixer.com/changelog/version-6/6/6.5/6.5.3.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.