public String getKey() {
        return this.key;
    }
<p>
The identifier of the target document attribute or metadata field. For example, 'Department' could be an
identifier for the target attribute or metadata field that includes the department names associated with the
documents.
</p>

@return The identifier of the target document attribute or metadata field. For example, 'Department' could be an
        identifier for the target attribute or metadata field that includes the department names associated with
        the documents.
aws-java-sdk-qbusiness/src/main/java/com/amazonaws/services/qbusiness/model/DocumentAttributeTarget.java