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 Check-Up which can resolve issues that cause many errors.

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.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

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)


Try AutoOps to detect and fix issues in your cluster:

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