public String getCACertificateIdentifier() {
        return this.cACertificateIdentifier;
    }
<p>
Indicates the certificate that needs to be associated with the instance.
</p>

@return Indicates the certificate that needs to be associated with the instance.
aws-java-sdk-docdb/src/main/java/com/amazonaws/services/docdb/model/ModifyDBInstanceRequest.java