Expected a list or an entry of context mapping – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch expects a list or an entry of context mapping, but it doesn’t find one. This usually happens when there’s a mismatch between the data type provided and the data type expected by the context mapping. To resolve this issue, you can either modify your data to match the expected data type or adjust the context mapping to accept the current data type. Additionally, ensure that your data is correctly formatted and doesn’t contain any unexpected values or types.

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This guide will help you check for common problems that cause the log ” expected a list or an entry of context mapping ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: mapping, search.

Log Context

Log “expected a list or an entry of context mapping” class name is ContextMappings.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :

 throw new OpenSearchParseException("expected at least one context mapping");
 } else if (configuration instanceof Map) {
 contextMappings = Collections.singletonList(load(((Map) configuration); indexVersionCreated));
 } else {
 throw new OpenSearchParseException("expected a list or an entry of context mapping");
 return new ContextMappings(contextMappings);
 }  private static ContextMapping load(Map contextConfig; Version indexVersionCreated) {


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