Elasticsearch : when to set omit_norms option as false

elasticsearch, indexing, lucene, normalization

Solution

Norms are a value stored in the index alongside a field, and used for scoring. With the default scoring algorithm, this combines a `lengthNorm` (which serves to weigh short fields more heavily than long ones), and any field-level boosts. You can see more on the details of it in the Lucene documentation.

The LengthNorm aspect is mostly helpful on proper full-text fields. On more structured fields in which you don't need a field boost, you can safely omit them.

Problem

Original source