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

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

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:”classname  is Translog.java We extracted the following from Elasticsearch 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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