public GroupCount withGroupKey(String groupKey) {
        setGroupKey(groupKey);
        return this;
    }
<p>
The name of the property that defines the group in the query results, as specified by the groupBy property in the
query request.
</p>

@param groupKey
       The name of the property that defines the group in the query results, as specified by the groupBy property
       in the query request.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-macie2/src/main/java/com/amazonaws/services/macie2/model/GroupCount.java