Cannot set doc values on field of type search as you type – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.1-8.9

Briefly, this error occurs when you try to set “doc_values” on a field of type “search_as_you_type” in Elasticsearch. This field type does not support “doc_values”. To resolve this issue, you can either change the field type to one that supports “doc_values” or remove the “doc_values” setting from the field. Alternatively, you can use a different method to achieve your goal that doesn’t require “doc_values” on a “search_as_you_type” field.

This guide will help you check for common problems that cause the log ” Cannot set [doc_values] on field of type [search_as_you_type] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “Cannot set [doc_values] on field of type [search_as_you_type]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 // This is only here because for some reason the initial impl of this always serialized
 // `doc_values=false`; even though it cannot be set; and so we need to continue
 // serializing it forever because of mapper assertions in mixed clusters.
 private final Parameter docValues = Parameter.docValuesParam(m -> false; false).addValidator(v -> {
 if (v) {
 throw new MapperParsingException("Cannot set [doc_values] on field of type [search_as_you_type]");
 }).alwaysSerialize();  private final Parameter maxShingleSize = Parameter.intParam(


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