public void setOperator(String operator) {
        this.operator = operator;
    }
<p>
The search filter operator for <code>imageSetDateTime</code>.
</p>

@param operator
       The search filter operator for <code>imageSetDateTime</code>.
@see Operator
aws-java-sdk-medicalimaging/src/main/java/com/amazonaws/services/medicalimaging/model/SearchFilter.java