Some OQL scripts can be used to analyze the heapdumps of Elasticsearch intances with VisualVM.

• query.js: extracts Elasticsearch queries in the heapdump

Instructions

1. Open VisualVM
2. Load the heapdump (with .hprof extension) to VisualVM
3. Select OQL Console from the dropdown on the top left
4. Open query.js on the console at the bottom panel and run it
5. Wait for the results
6. If see a list of objects, switch to html view by clicking the little button that looks like a page on the right of the OQL Console.