Can only use prefix queries on keyword and text fields – not on – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.8

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Briefly, this error occurs when a prefix query is used on a field type that doesn’t support it. Elasticsearch only supports prefix queries on keyword and text fields. If you’re trying to use it on a numeric, date, or other non-string field, you’ll encounter this error. To resolve this, you can either change the field type to keyword or text if possible, or use a different type of query that is compatible with the current field type. Alternatively, you could create a keyword or text sub-field for querying purposes.

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This guide will help you check for common problems that cause the log ” Can only use prefix queries on keyword and text fields – not on [ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “Can only use prefix queries on keyword and text fields – not on [” class name is MappedFieldType.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 throw new IllegalArgumentException("Can only use fuzzy queries on keyword and text fields - not on [" + name
 + "] which is of type [" + typeName() + "]");
 }  public Query prefixQuery(String value; @Nullable MultiTermQuery.RewriteMethod method; QueryShardContext context) {
 throw new QueryShardException(context; "Can only use prefix queries on keyword and text fields - not on [" + name
 + "] which is of type [" + typeName() + "]");
 }  public Query wildcardQuery(String value;
 @Nullable MultiTermQuery.RewriteMethod method;

 

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