code: public UUID createEntityRole(UUID appId, String versionId, UUID entityId, CreateEntityRoleOptionalParameter createEntityRoleOptionalParameter) {
          return createEntityRoleWithServiceResponseAsync(appId, versionId, entityId, createEntityRoleOptionalParameter).toBlocking().single().body();
      }
docs: Create an entity role for an entity in the application.
  
  @param appId The application ID.
  @param versionId The version ID.
  @param entityId The entity model ID.
  @param createEntityRoleOptionalParameter the object representing the optional parameters to be set before calling this API
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws ErrorResponseException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the UUID object if successful.