Failed to parse – How to solve related issues

Opster Team

Jan-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Failed to parse ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “Failed to parse [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                 assert !request.isRecordExecution();
                Watch watch = watchParser.parse(ExecuteWatchRequest.INLINE_WATCH_ID; true; request.getWatchSource();
                    request.getXContentType(); SequenceNumbers.UNASSIGNED_SEQ_NO; SequenceNumbers.UNASSIGNED_PRIMARY_TERM);
                executeWatch(request; listener; watch; false);
            } catch (IOException e) {
                logger.error(new ParameterizedMessage("failed to parse [{}]"; request.getId()); e);
        } else {
            listener.onFailure(new IllegalArgumentException("no watch provided"));


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