code: public Observable<DatabaseAccountListConnectionStringsResultInner> listConnectionStringsAsync(String resourceGroupName, String accountName) {
          return listConnectionStringsWithServiceResponseAsync(resourceGroupName, accountName).map(new Func1<ServiceResponse<DatabaseAccountListConnectionStringsResultInner>, DatabaseAccountListConnectionStringsResultInner>() {
              @Override
              public DatabaseAccountListConnectionStringsResultInner call(ServiceResponse<DatabaseAccountListConnectionStringsResultInner> response) {
                  return response.body();
              }
          });
      }
docs: Lists the connection strings for the specified Azure Cosmos DB database account.
  
  @param resourceGroupName Name of an Azure resource group.
  @param accountName Cosmos DB database account name.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the DatabaseAccountListConnectionStringsResultInner object