docstr: get the first node's build version as milvus build version
docstr_tok: ["get","the","first","node","'s","build","version","as","milvus","build","version"]
code: def build_version(self):
      """get the first node's build version as milvus build version"""
      return (
          self.nodes[0]
          .get("infos")
          .get("system_info")
          .get("system_version")
      )
  
file_path: milvus/tests/python_client/common/milvus_sys.py
imports: import ujson
  import json
  from pymilvus.grpc_gen import milvus_pb2
  from pymilvus import connections
label_desc: Use image node_id 2 for calling the MilvusSys obj's underlying member method code with example usage: obj.build_version() and returns: self