[[painless-weight-context]] === Weight context Use a Painless script to create a {es_version}/index-modules-similarity.html[weight] for use in a <>. Weight is used to prevent recalculation of constants that remain the same across documents. *Variables* `params` (`Map`, read-only):: User-defined parameters passed in as part of the query. `query.boost` (`float`, read-only):: The boost value if provided by the query. If this is not provided the value is `1.0f`. `field.docCount` (`long`, read-only):: The number of documents that have a value for the current field. `field.sumDocFreq` (`long`, read-only):: The sum of all terms that exist for the current field. If this is not available the value is `-1`. `field.sumTotalTermFreq` (`long`, read-only):: The sum of occurrences in the index for all the terms that exist in the current field. If this is not available the value is `-1`. `term.docFreq` (`long`, read-only):: The number of documents that contain the current term in the index. `term.totalTermFreq` (`long`, read-only):: The total occurrences of the current term in the index. *Return* `double`:: A scoring factor used across all documents. *API* The standard <> is available.