public String getSource() {
        return this.source;
    }
<p>
A value that indicates to return only parameters for a specific source. Parameter sources can be
<code>engine</code>, <code>service</code>, or <code>customer</code>.
</p>

@return A value that indicates to return only parameters for a specific source. Parameter sources can be
        <code>engine</code>, <code>service</code>, or <code>customer</code>.
aws-java-sdk-docdb/src/main/java/com/amazonaws/services/docdb/model/DescribeDBClusterParametersRequest.java