public String getCertificateIdentifier() {
        return this.certificateIdentifier;
    }
<p>
The unique key that identifies a certificate.
</p>
<p>
Example: <code>rds-ca-2019</code>
</p>

@return The unique key that identifies a certificate.</p>
        <p>
        Example: <code>rds-ca-2019</code>
aws-java-sdk-docdb/src/main/java/com/amazonaws/services/docdb/model/Certificate.java