How To Solve Issues Related to Log – Could not lock IndexWriter

How To Solve Issues Related to Log – Could not lock IndexWriter

Updated: Jan-20

Elasticsearch Version: 1.7-8.0


Before you begin reading this guide try our beta Elasticsearch Health Check-Up it analyses JSON’s to provide personalized recommendations that can improve your clusters performance.

To troubleshoot log “Could not lock IndexWriter” it’s important to understand a few problems related to Elasticsearch concepts index. See bellow important tips and explanations on these concepts

Log Context

Log”Could not lock IndexWriter” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

     private IndexWriter createWriter() throws IOException {
        try {
            final IndexWriterConfig iwc = getIndexWriterConfig();
            return createWriter(; iwc);
        } catch (LockObtainFailedException ex) {
            logger.warn("could not lock IndexWriter"; ex);
            throw ex;

    // pkg-private for testing

Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Could not lock IndexWriter isLocked [false] 1.08 K 2

Could Not Lock Indexwriter Islocked  

About Opster

Opster detects root causes of Elasticsearch problems, provides automated recommendations and can perform various actions to prevent issues and optimize performance

Find Configuration Errors

Analyze Now