Keep Types Token Filter

Elastic Stack Elasticsearch
1

There is a Keep Types Token filter, see https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-keep-types-tokenfilter.html

What are the types that you can list in the "types" array?

2

It uses the Lucene TypeTokenFilter, and it should use the Lucene constants.
I have not used this filter in years, and the types used to be properly
defined: https://lucene.apache.org/core/3_5_0/api/core/constant-values.html
I have not found a better list for Lucene 5/6, or perhaps the Elasticsearch
documentation is using an old constant.

Since it is Lucene, it means it is poorly documented. :slight_smile: Grepping through
the code should find the answers.

Ivan