Adding clear cache test step (#339)

Signed-off-by: Martin Gaievski <[email protected]>

benchmarks/perf-tool/okpt/test/steps/factory.py

@@ -9,7 +9,7 @@
 from okpt.test.steps.base import Step, StepConfig
 
 from okpt.test.steps.steps import CreateIndexStep, DisableRefreshStep, RefreshIndexStep, DeleteIndexStep, \
-    TrainModelStep, DeleteModelStep, ForceMergeStep, IngestStep, QueryStep
+    TrainModelStep, DeleteModelStep, ForceMergeStep, ClearCacheStep, IngestStep, QueryStep
 
 
 def create_step(step_config: StepConfig) -> Step:
@@ -31,5 +31,7 @@ def create_step(step_config: StepConfig) -> Step:
         return QueryStep(step_config)
     elif step_config.step_name == ForceMergeStep.label:
         return ForceMergeStep(step_config)
+    elif step_config.step_name == ClearCacheStep.label:
+        return ClearCacheStep(step_config)
 
     raise ConfigurationError(f'Invalid step {step_config.step_name}')

benchmarks/perf-tool/okpt/test/steps/steps.py

@@ -138,6 +138,28 @@ def _action(self):
     def _get_measures(self) -> List[str]:
         return ['took']
 
+class ClearCacheStep(OpenSearchStep):
+    """See base class."""
+
+    label = 'clear_cache'
+
+    def __init__(self, step_config: StepConfig):
+        super().__init__(step_config)
+        self.index_name = parse_string_param('index_name', step_config.config,
+                                             {}, None)
+
+    def _action(self):
+        while True:
+            try:
+                self.opensearch.indices.clear_cache(
+                    index=self.index_name)
+                return {}
+            except:
+                pass
+
+    def _get_measures(self) -> List[str]:
+        return ['took']
+
 
 class TrainModelStep(OpenSearchStep):
     """See base class."""