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

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when the operation size specified in an OpenSearch request is less than the minimum required size of 4. This could be due to a misconfiguration or a programming error. To resolve this issue, you can increase the operation size to at least 4 in your OpenSearch request. Alternatively, you can review your OpenSearch configuration and ensure that the operation size is set correctly. If the error persists, you may need to debug your code to identify and fix any programming errors that could be causing this issue.

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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 OpenSearch concepts: index.

Log Context

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

 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


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