Unknown vector index options type type for field fieldName – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8-8.9

Briefly, this error occurs when an unknown or unsupported type is specified for the vector index options in the field mapping. Elasticsearch supports a limited set of types for vector fields, and if an unsupported type is used, it throws this error. To resolve this issue, you should check the Elasticsearch documentation for the correct types supported for vector fields. Then, update your field mapping with a supported type. Also, ensure that the field data you’re indexing matches the specified type in the field mapping.

This guide will help you check for common problems that cause the log ” Unknown vector index options type [” + type + “] for field [” + fieldName + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “Unknown vector index options type [” + type + “] for field [” + fieldName + “]” class name is DenseVectorFieldMapper.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 }
 String type = XContentMapValues.nodeStringValue(typeNode);
 if (type.equals("hnsw")) {
 return HnswIndexOptions.parseIndexOptions(fieldName; indexOptionsMap);
 } else {
 throw new MapperParsingException("Unknown vector index options type [" + type + "] for field [" + fieldName + "]");
 }
 }  /**
 * @return the custom kNN vectors format that is configured for this field or

 

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