Segment Replication is not enabled on Index – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 2.6-2.6

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Briefly, this error occurs when the segment replication feature is not activated on a specific index in OpenSearch. This feature is crucial for data redundancy and recovery in case of node failures. To resolve this issue, you can enable segment replication by adjusting the index settings. Use the “update index settings” API to set the “number_of_replicas” to a value greater than zero. Alternatively, you can enable it during index creation by including the “number_of_replicas” setting in the index creation request.

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This guide will help you check for common problems that cause the log ” Segment Replication is not enabled on Index: ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: indices, admin, replication.

Log Context

Log “Segment Replication is not enabled on Index:” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 ) {
 // throw exception if API call is made on single index with segment replication disabled.
 if (singleIndexWithSegmentReplicationDisabled != null) {
 String index = singleIndexWithSegmentReplicationDisabled;
 singleIndexWithSegmentReplicationDisabled = null;
 throw new OpenSearchStatusException("Segment Replication is not enabled on Index: " + index; RestStatus.BAD_REQUEST);
 String[] shards = request.shards();
 Set set = new HashSet<>();
 if (shards.length > 0) {
 for (String shard : shards) {


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