code: public InputStream find(String id) {
          assertNotEmpty(id, "id");
          return couchDbClient.get(new DatabaseURIHelper(dbUri).documentUri(id));
      }
docs: Finds a document and return the result as {@link InputStream}.
  <p><b>Note</b>: The stream must be closed after use to release the connection.
  
  @param id The document _id field.
  @return The result as {@link InputStream}
  @throws NoDocumentException If the document is not found in the database.
  @see #find(String, String)