Class RelevanceThreshold (0.20.2) 

RelevanceThreshold(value)

The relevance threshold of the search results. The higher relevance threshold is, the higher relevant results are shown and the less number of results are returned.

Enums
Name Description
RELEVANCE_THRESHOLD_UNSPECIFIED Default value. In this case, server behavior defaults to Google defined threshold.
LOWEST Lowest relevance threshold.
LOW Low relevance threshold.
MEDIUM Medium relevance threshold.
HIGH High relevance threshold.