public String getExtensionIdentifier() {
        return this.extensionIdentifier;
    }
<p>
The name, the ID, or the Amazon Resource Name (ARN) of the extension.
</p>

@return The name, the ID, or the Amazon Resource Name (ARN) of the extension.
aws-java-sdk-appconfig/src/main/java/com/amazonaws/services/appconfig/model/GetExtensionRequest.java