Specified foreach object was not a an array/collection: – 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 ” specified foreach object was not a an array/collection: ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.


Log Context

Log “specified foreach object was not a an array/collection: [{}]”classname  is ActionWrapper.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

}
 }
 } else if (object == null) {
 throw new ElasticsearchException("specified foreach object was null: [{}]"; path);
 } else {
 throw new ElasticsearchException("specified foreach object was not a an array/collection: [{}]"; path);
 } 
 // check if we have mixed results; then set to partial failure
 final Set statuses = results.stream().map(Action.Result::status).collect(Collectors.toSet());
 Action.Result.Status status;

 

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