public void setReturnItemCollectionMetrics(String returnItemCollectionMetrics) {
        this.returnItemCollectionMetrics = returnItemCollectionMetrics;
    }
<p>
Determines whether item collection metrics are returned. If set to <code>SIZE</code>, the response includes
statistics about item collections, if any, that were modified during the operation are returned in the response.
If set to <code>NONE</code> (the default), no statistics are returned.
</p>

@param returnItemCollectionMetrics
       Determines whether item collection metrics are returned. If set to <code>SIZE</code>, the response
       includes statistics about item collections, if any, that were modified during the operation are returned
       in the response. If set to <code>NONE</code> (the default), no statistics are returned.
@see ReturnItemCollectionMetrics
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/model/BatchWriteItemRequest.java