pr: 136915
summary: Implement native synthetic source for normalized keywords
area: Mapping
type: breaking
issues: []
breaking:
  title: Implement native synthetic source for normalized keywords
  area: Mapping
  details: "This adds a new mapping parameter `normalizer_skip_store_original_value` to keyword fields. When this\
  \ parameter is set, and synthetic_source is enabled, keyword fields with configured normalizers will not store the\
  \ original non-normalized value in _ignored_source, and will instead use the normalized value to reconstruct the\
  \ source. This parameter enabled by default for the built-in `lowercase` normalizer, and is disabled by default for\
  \ other custom normalizers."
  impact: "Keyword fields using the `lowercase` normalizer will return the normalized value in the source when synthetic\
    \ source is enabled."
  notable: false
