case sqlparser.LessThanStr:
query = elastic.NewRangeQuery(colName).Lt(colValues[0])
// Not elastic.NewTermQuery to support partial word match for String custom search attributes.
if tp == enumspb.INDEXED_VALUE_TYPE_KEYWORD || tp == enumspb.INDEXED_VALUE_TYPE_KEYWORD_LIST {
query = elastic.NewTermQuery(colName, colValues[0])
query = elastic.NewMatchQuery(colName, colValues[0])
}