[8.17] [Obs AI Assistant] Use update-by-query for semantic_text migration (#220255)#220642
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sorenlouv merged 6 commits intoelastic:8.17from May 14, 2025
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…lastic#220255) Closes: elastic#220339 **Background** The `semantic_text` migration will migrate content from `text` field to `semantic_text` field. It does so with a recursive function that continuously retrieves knowledge base entries if they do not contain `semantic_text` and updates them accordingly. **Problem** It is possible to save empty knowledge base entries (elastic#220342) where `text` and `semantic_text` will be empty. Doing this will cause the migration script to run indefinitely leading to OOM on the affected clusters. Temporary workaround is to delete empty knowledge base entries: ```jsonc POST .kibana-observability-ai-assistant-kb/_delete_by_query { "query": { "bool": { "must": [{ "exists": { "field": "text" }}], "must_not": [ { "wildcard": { "text": "*" } } ] } } } ``` If you want to perform a dry run (find offending documents without deleting them) run this: ```jsonc GET .kibana-observability-ai-assistant-kb/_search { "query": { "bool": { "must": [{ "exists": { "field": "text" }}], "must_not": [ { "wildcard": { "text": "*" } } ] } } } ``` (cherry picked from commit 96d1692)
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