Data_stream ” + dataStreamName + ” already exists – How to solve this Elasticsearch error

Opster Team

March-22, 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 ” data_stream ” + dataStreamName + ” already exists ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster, metadata.

Log Context

Log “data_stream [” + dataStreamName + “] already exists”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (currentState.metadata().dataStreams().containsKey(dataStreamName)) {
 throw new ResourceAlreadyExistsException("data_stream [" + dataStreamName + "] already exists");
 (s1; s2) -> new IllegalArgumentException("data_stream [" + s1 + "] " + s2)


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