Updating Edge Properties in Batches

public static void updateBatchEdges(GraphClient graphClient) throws ApiException 
{
    // Construct the edge information. Do not specify the index.
    EdgeWithIndex edgeWithoutIndex = new EdgeWithIndex();
    edgeWithoutIndex.setSource("46");
    edgeWithoutIndex.setTarget("37");
    edgeWithoutIndex.setLabel("rate");
    Map<String, List<Object>> properties = new HashMap<>();
    properties.put("Rating", Arrays.asList("5"));
    properties.put("Datetime", Arrays.asList("2020-01-0120:30:05"));
    edgeWithoutIndex.setProperties(properties);

    // Construct the edge information. Specify the index.
    EdgeWithIndex edgeWithIndex = new EdgeWithIndex();
    edgeWithIndex.setSource("46");
    edgeWithIndex.setTarget("38");
    edgeWithIndex.setIndex("0");
    edgeWithIndex.setProperties(properties);

    // Form the edge list.
    List<EdgeWithIndex> edges = new ArrayList<>();
    edges.add(edgeWithoutIndex);
    edges.add(edgeWithIndex);

    // Construct a request for updating edge properties in batches.
    UpdateBatchEdgePropertyReq updateBatchEdgeReq = new UpdateBatchEdgePropertyReq();
    updateBatchEdgeReq.setEdges(edges);

    // Execute the request for updating edge properties in batches.
    Map<String, Object> result = graphClient.updateBatchEdge("batch-update", updateBatchEdgeReq);    
}