public void setClientContext(String clientContext) {
        this.clientContext = clientContext;
    }
Intended to supply a device ID that will populate the lastModifiedBy field referenced in other methods. The
ClientContext field is not yet implemented.

@param clientContext
       Intended to supply a device ID that will populate the lastModifiedBy field referenced in other methods.
       The ClientContext field is not yet implemented.
aws-java-sdk-cognitosync/src/main/java/com/amazonaws/services/cognitosync/model/UpdateRecordsRequest.java