Failed to acquire close-read-lock – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.16-8.9

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your Elasticsearch operation.

Briefly, this error occurs when Elasticsearch is unable to obtain a lock on the index files during a close operation. This could be due to another process accessing the files or insufficient permissions. To resolve this issue, you can try the following: 1) Ensure no other processes are accessing the index files. 2) Check and adjust the file permissions if necessary. 3) Restart the Elasticsearch service. 4) If the issue persists, consider reindexing your data.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

This guide will help you check for common problems that cause the log ” failed to acquire close-read-lock ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “failed to acquire close-read-lock” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 ConnectionProfile finalProfile = maybeOverrideConnectionProfile(profile);
 if (closeLock.readLock().tryLock() == false) {
 assert false : "should not get here ever because close-write-lock should only be held on shutdown";
 throw new ConnectTransportException(node; "failed to acquire close-read-lock");
 try {
 initiateConnection(node; finalProfile; listener);
 } finally {


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?