code: public ServiceFuture<InputInner> updateAsync(String resourceGroupName, String jobName, String inputName, InputInner input, String ifMatch, final ServiceCallback<InputInner> serviceCallback) {
          return ServiceFuture.fromHeaderResponse(updateWithServiceResponseAsync(resourceGroupName, jobName, inputName, input, ifMatch), serviceCallback);
      }
docs: Updates an existing input under an existing streaming job. This can be used to partially update (ie. update one or two properties) an input without affecting the rest the job or input definition.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param jobName The name of the streaming job.
  @param inputName The name of the input.
  @param input An Input object. The properties specified here will overwrite the corresponding properties in the existing input (ie. Those properties will be updated). Any properties that are set to null here will mean that the corresponding property in the existing input will remain the same and not change as a result of this PATCH operation.
  @param ifMatch The ETag of the input. Omit this value to always overwrite the current input. Specify the last-seen ETag value to prevent accidentally overwritting concurrent changes.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object