Failed to flush index – 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 can resolve issues that cause many errors.

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

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “Failed to flush index” classname is IndexShard.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                     logger.debug("submitting async flush request");
                    final AbstractRunnable flush = new AbstractRunnable() {
                        
Override
                        public void onFailure(final Exception e) {
                            if (state != IndexShardState.CLOSED) {
                                logger.warn("failed to flush index"; e);
                            }
                        }

                        
Override
                        protected void doRun() throws IOException {


 

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