code: public ASTField getField(VariableElement variableElement) {
          ASTAccessModifier modifier = buildAccessModifier(variableElement);
  
          return new ASTElementField(variableElement, astTypeBuilderVisitor, modifier, getAnnotations(variableElement));
      }
docs: Build a ASTElementField from the given VariableElement
  
  @param variableElement required input Element
  @return ASTElementField