Operation size must be at least 4 but was – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when the size of the operation in Elasticsearch is less than the minimum required size of 4. This could be due to incorrect configuration or a bug in the code. To resolve this issue, you can check the configuration settings and ensure that the operation size is set to at least 4. If the problem persists, you may need to debug your code to identify and fix any potential bugs that could be causing this error.

This guide will help you check for common problems that cause the log ” operation size must be at least 4 but was: ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “operation size must be at least 4 but was:” class name is Translog.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 public static Translog.Operation readOperation(BufferedChecksumStreamInput in) throws IOException {
 final Translog.Operation operation;
 try {
 final int opSize = in.readInt();
 if (opSize < 4) { // 4byte for the checksum
 throw new TranslogCorruptedException(in.getSource(); "operation size must be at least 4 but was: " + opSize);
 in.resetDigest(); // size is not part of the checksum!
 if (in.markSupported()) { // if we can we validate the checksum first
 // we are sometimes called when mark is not supported this is the case when
 // we are sending translogs across the network with LZ4 compression enabled - currently there is no way s


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?