public void setOperator(String operator) {
        this.operator = operator;
    }
<p>
The operator used by the filter call.
</p>

@param operator
       The operator used by the filter call.
@see InstancePropertyFilterOperator
aws-java-sdk-ssm/src/main/java/com/amazonaws/services/simplesystemsmanagement/model/InstancePropertyStringFilter.java