code: protected GraphQLFieldDefinition getFieldDef(GraphQLSchema schema, GraphQLObjectType parentType, Field field) {
          return Introspection.getFieldDef(schema, parentType, field.getName());
      }
docs: Called to discover the field definition give the current parameters and the AST {@link Field}
  
  @param schema     the schema in play
  @param parentType the parent type of the field
  @param field      the field to find the definition of
  
  @return a {@link GraphQLFieldDefinition}