public void setCollectionId(String collectionId) {
        this.collectionId = collectionId;
    }
<p>
The ID of an existing collection containing the UserID.
</p>

@param collectionId
       The ID of an existing collection containing the UserID.
aws-java-sdk-rekognition/src/main/java/com/amazonaws/services/rekognition/model/DisassociateFacesRequest.java