Update warmer – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 1.7-1.7

Briefly, this error occurs when there’s an attempt to update a warmer in Elasticsearch. Warmers were deprecated in Elasticsearch 5.0 and completely removed in 6.0. They were used to pre-run expensive queries to improve search speed. To resolve this issue, you should remove any code that attempts to update a warmer. Instead, consider using the Elasticsearch feature “index sorting” to improve search speed, or optimize your queries and indexing strategy to ensure efficient data retrieval.

This guide will help you check for common problems that cause the log ” [{}] update warmer [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: admin, indices and warmer.

Log Context

Log “[{}] update warmer [{}]” classname is TransportPutWarmerAction.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                                if (!found) {
                                    logger.info("[{}] put warmer [{}]"; index; request.name());
                                    entries.add(new IndexWarmersMetaData.Entry(request.name(); request.searchRequest().types(); request.searchRequest().queryCache(); source));
                                } else {
                                    logger.info("[{}] update warmer [{}]"; index; request.name());
                                warmers = new IndexWarmersMetaData(entries.toArray(new IndexWarmersMetaData.Entry[entries.size()]));
                            IndexMetaData.Builder indexBuilder = IndexMetaData.builder(indexMetaData).putCustom(IndexWarmersMetaData.TYPE; warmers);


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