feat: Unified highlighting (#206)

The unified highlighter is only supported in elasticsearch 6.0 and later.

feat: Runtime field script params (#202)

Co-authored-by: Alejandro Marulanda <alejandro.marulanda@netcentric.biz>

feat: Add kNN Query (#198)

kNN search was added to Elasticsearch in v8.0

Co-authored-by: kennylindahl <haxxblaster@gmail.com>
Co-authored-by: Andreas Franzon <andreas.franzon@schibsted.com>

fix: runtime field class methods return types (#200)

There was a mismatch between the return types as defined in the JSDoc
comments and the implicit return types inferred by TypeScript.

feat: force release

feat: Add support for weighted average aggregation (#197)

Weighted avg aggregation was added in Elasticsearch 6.4.

feat: Add full-text combined fields query (#195)

combined_fields query was added in Elasticsearch 7.13.

feat: Add rank_feature query (#194)

Rank feature query was added in Elasticsearch v7.0.

feat: Add support for script score query (#191)

Script score query was added in Elasticsearch v7.0

feat: Add support for format option to sort (#187)

format option was added to sort in Elasticsearch v7.13