code: public ExpressRouteCircuitPeeringInner createOrUpdate(String resourceGroupName, String circuitName, String peeringName, ExpressRouteCircuitPeeringInner peeringParameters) {
          return createOrUpdateWithServiceResponseAsync(resourceGroupName, circuitName, peeringName, peeringParameters).toBlocking().last().body();
      }
docs: Creates or updates a peering in the specified express route circuits.
  
  @param resourceGroupName The name of the resource group.
  @param circuitName The name of the express route circuit.
  @param peeringName The name of the peering.
  @param peeringParameters Parameters supplied to the create or update express route circuit peering operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the ExpressRouteCircuitPeeringInner object if successful.