[skip ci] Test chaos memory stress indexnode (#10760)

Signed-off-by: NThreadDao <yufen.zong@zilliz.com>

tests/python_client/chaos/chaos_objects/memory_stress/chaos_indexnode_memory_stress.yaml

+kind: StressChaos
+apiVersion: chaos-mesh.org/v1alpha1
+metadata:
+  name: test-indexnode-memory-stress
+  namespace: chaos-testing
+spec:
+  selector:
+    namespaces:
+      - chaos-testing
+    labelSelectors:
+      app.kubernetes.io/name: milvus
+      app.kubernetes.io/instance: mic-memory
+      app.kubernetes.io/component: indexnode
+  mode: one
+  stressors:
+    memory:
+      workers: 4
+      size: 512Mi
\ No newline at end of file

tests/python_client/chaos/test_chaos_memory_stress.py

-from time import sleep
+from time import sleep, time
 
 import pytest
 import datetime
@@ -145,4 +145,54 @@ class TestChaosData:
                 4.Inject memory stress chaos
         expected:
         """
-        pass
+        # init collection and insert 250 nb
+        nb = 25600
+        dim = 512
+        c_name = cf.gen_unique_str('chaos_memory')
+        index_params = {"index_type": "IVF_SQ8", "metric_type": "L2", "params": {"nlist": 128}}
+
+        collection_w = ApiCollectionWrapper()
+        collection_w.init_collection(name=c_name,
+                                     schema=cf.gen_default_collection_schema(dim=dim))
+        # insert 256000 512 dim entities 512Mi
+        for i in range(10):
+            t0_insert = datetime.datetime.now()
+            df = cf.gen_default_dataframe_data(nb=nb, dim=dim)
+            res = collection_w.insert(df)[0]
+            assert res.insert_count == nb
+            # log.info(f'After {i + 1} insert, num_entities: {collection_w.num_entities}')
+            tt_insert = datetime.datetime.now() - t0_insert
+            log.info(f"{i} insert data cost: {tt_insert}")
+
+        # flush
+        t0_flush = datetime.datetime.now()
+        assert collection_w.num_entities == nb * 10
+        tt_flush = datetime.datetime.now() - t0_flush
+        log.info(f'flush {nb * 10} entities cost: {tt_flush}')
+
+        # create index
+        # index
+        t0_index = datetime.datetime.now()
+        index, _ = collection_w.create_index(field_name=ct.default_float_vec_field_name,
+                                             index_params=index_params)
+        tt_index = datetime.datetime.now() - t0_index
+
+        log.info(f"create index cost: {tt_index}")
+        log.info(collection_w.indexes)
+
+        # indexNode start build index, inject chaos memory stress
+        chaos_config = gen_experiment_config(chaos_yaml)
+        log.debug(chaos_config)
+        chaos_res = CusResource(kind=chaos_config['kind'],
+                                group=constants.CHAOS_GROUP,
+                                version=constants.CHAOS_VERSION,
+                                namespace=constants.CHAOS_NAMESPACE)
+        chaos_res.create(chaos_config)
+        log.debug("inject chaos")
+
+        time.sleep(constants.WAIT_PER_OP)
+
+
+
+
+