Expected at least one context mapping – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch tries to execute a context suggester query but doesn’t find any context mapping in the index. Context suggesters require at least one context mapping to provide suggestions. To resolve this issue, you can either add a context mapping to your index or remove the context suggester from your query if it’s not needed. If you’re adding a context mapping, ensure it’s properly defined and relevant to your data. If you’re removing the context suggester, ensure your query still meets your requirements.

This guide will help you check for common problems that cause the log ” expected at least one context mapping ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search, mapping.

Log Context

Log “expected at least one context mapping” class name is ContextMappings.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 List configurations = (List) configuration;
 for (Object contextConfig : configurations) {
 contextMappings.add(load((Map) contextConfig));
 if (contextMappings.size() == 0) {
 throw new ElasticsearchParseException("expected at least one context mapping");
 } else if (configuration instanceof Map) {
 contextMappings = Collections.singletonList(load(((Map) configuration)));
 } else {
 throw new ElasticsearchParseException("expected a list or an entry of context mapping");