code: public Observable<List<RecommendedActionInner>> listByDatabaseAdvisorAsync(String resourceGroupName, String serverName, String databaseName, String advisorName) {
          return listByDatabaseAdvisorWithServiceResponseAsync(resourceGroupName, serverName, databaseName, advisorName).map(new Func1<ServiceResponse<List<RecommendedActionInner>>, List<RecommendedActionInner>>() {
              @Override
              public List<RecommendedActionInner> call(ServiceResponse<List<RecommendedActionInner>> response) {
                  return response.body();
              }
          });
      }
docs: Gets list of Database Recommended Actions.
  
  @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 serverName The name of the server.
  @param databaseName The name of the database.
  @param advisorName The name of the Database Advisor.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the List&lt;RecommendedActionInner&gt; object