code: @POST
      public Response create(final String resource)
              throws IOException {
          return execute(getRequest(RequestTypeEnum.POST, RestOperationTypeEnum.TRANSACTION).resource(resource));
      }
docs: Create all resources in one transaction
  
  @param resource the body of the post method containing the bundle of the resources being created in a xml/json form
  @return the response
  @see <a href="https://www.hl7.org/fhir/http.html#create">https://www.hl7. org/fhir/http.html#create</a>