code: public ExplicitListItem getExplicitListItem(UUID appId, String versionId, UUID entityId, long itemId) {
          return getExplicitListItemWithServiceResponseAsync(appId, versionId, entityId, itemId).toBlocking().single().body();
      }
docs: Get the explicit list of the pattern.any entity.
  
  @param appId The application ID.
  @param versionId The version ID.
  @param entityId The Pattern.Any entity Id.
  @param itemId The explicit list item Id.
  @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 ExplicitListItem object if successful.