The dims property must be specified for field name – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.3-7.9

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Briefly, this error occurs when the “dims” property is not specified for a field in Elasticsearch. The “dims” property is required for certain types of fields, such as dense_vector and sparse_vector, which are used for machine learning purposes. To resolve this issue, you should specify the “dims” property in the mapping of the field. This can be done by adding ‘”dims”: number’ to the field’s mapping, where ‘number’ is the number of dimensions for the vector. If the field is not supposed to be a vector, you should change its type to the correct one.

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This guide will help you check for common problems that cause the log ” The [dims] property must be specified for field [” + name + “]. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “The [dims] property must be specified for field [” + name + “].” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 public Mapper.Builder parse(String name; Map node; ParserContext parserContext) throws MapperParsingException {
 DenseVectorFieldMapper.Builder builder = new DenseVectorFieldMapper.Builder(name);
 Object dimsField = node.remove("dims");
 if (dimsField == null) {
 throw new MapperParsingException("The [dims] property must be specified for field [" + name + "].");
 int dims = XContentMapValues.nodeIntegerValue(dimsField);
 return builder.dims(dims);


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