Foreach object was an empty list; could not run any action – 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 ” foreach object was an empty list; could not run any action ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.


Log Context

Log “foreach object [{}] was an empty list; could not run any action”classname  is ActionWrapper.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

List results = new ArrayList<>();
 Object object = ObjectPath.eval(path; toMap(ctx));
 int runs = 0;
 if (object instanceof Collection collection) {
 if (collection.isEmpty()) {
 throw new ElasticsearchException("foreach object [{}] was an empty list; could not run any action"; path);
 } else {
 for (Object o : collection) {
 if (runs >= maxIterations) {
 break;
 }

 

See how you can use AutoOps to resolve issues


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