code: def index_def(self):
      return self._index_def
  
file_path: evadb/evadb/plan_nodes/create_index_plan.py
imports: from typing import List
  from evadb.catalog.catalog_type import VectorStoreType
  from evadb.expression.abstract_expression import AbstractExpression
  from evadb.expression.function_expression import FunctionExpression
  from evadb.parser.create_statement import ColumnDefinition
  from evadb.parser.table_ref import TableRef
  from evadb.plan_nodes.abstract_plan import AbstractPlan
  from evadb.plan_nodes.types import PlanOprType
label_desc: Use image node_id 8 for calling the CreateIndexPlan obj's underlying member method code with example usage: obj.index_def() and returns: self