Automatic spell correction built by Google Retail Search. Search will
be based on the corrected query if found.
SuggestionOnly
Google Retail Search will try to find a spell suggestion if there
is any and put in the
[SearchResponse.corrected_query][google.cloud.retail.v2.SearchResponse.corrected_query].
The spell suggestion will not be used as the search query.
Unspecified
Unspecified spell correction mode. In this case, server behavior
defaults to
[Mode.AUTO][google.cloud.retail.v2.SearchRequest.SpellCorrectionSpec.Mode.AUTO].