public DocumentDBEventSourceConfig withCollectionName(String collectionName) {
        setCollectionName(collectionName);
        return this;
    }
<p>
The name of the collection to consume within the database. If you do not specify a collection, Lambda consumes
all collections.
</p>

@param collectionName
       The name of the collection to consume within the database. If you do not specify a collection, Lambda
       consumes all collections.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-lambda/src/main/java/com/amazonaws/services/lambda/model/DocumentDBEventSourceConfig.java