Failed to add query – parser returned null – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch tries to add a query parser that returns null. This could be due to a faulty or missing query parser plugin. To resolve this issue, you can try the following: 1) Check if the required query parser plugin is installed and functioning correctly. 2) If the plugin is missing, install it. 3) If the plugin is faulty, try updating or reinstalling it. 4) Check your query syntax to ensure it’s correct.

This guide will help you check for common problems that cause the log ” failed to add query [{}] – parser returned null ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: delete-by-query, index, parser and percolator.

Log Context

Log “failed to add query [{}] – parser returned null” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

// id is only used for logging; if we fail we log the id in the catch statement
                final Query parseQuery = percolator.parsePercolatorDocument(null; fieldsVisitor.source());
                if (parseQuery != null) {
                    queries.put(BytesRef.deepCopyOf(id); parseQuery);
                } else {
                    logger.warn("failed to add query [{}] - parser returned null"; id);

            } catch (Exception e) {
                logger.warn("failed to add query [{}]"; e; id.utf8ToString());


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