code: public static SchemaBuilder fromJson(String json) {
          try {
              return JsonSerializer.fromString(json, SchemaBuilder.class);
          } catch (IOException e) {
              throw new IndexException(e, "Unparseable JSON schema: {}: {}", e.getMessage(), json);
          }
      }
docs: Returns the {@link Schema} contained in the specified JSON {@code String}.
  
  @param json a {@code String} containing the JSON representation of the {@link Schema} to be parsed
  @return the schema contained in the specified JSON {@code String}