ImportanceLevel(value)The importance level for CustomRankingInfo.ranking_expression.
Values: IMPORTANCE_LEVEL_UNSPECIFIED (0): Default value if the importance level isn't specified. NONE (1): The given ranking expression is of None importance, existing relevance score (determined by API algorithm) dominates job's final ranking position. LOW (2): The given ranking expression is of Low importance in terms of job's final ranking position compared to existing relevance score (determined by API algorithm). MILD (3): The given ranking expression is of Mild importance in terms of job's final ranking position compared to existing relevance score (determined by API algorithm). MEDIUM (4): The given ranking expression is of Medium importance in terms of job's final ranking position compared to existing relevance score (determined by API algorithm). HIGH (5): The given ranking expression is of High importance in terms of job's final ranking position compared to existing relevance score (determined by API algorithm). EXTREME (6): The given ranking expression is of Extreme importance, and dominates job's final ranking position with existing relevance score (determined by API algorithm) ignored.