added cleanup

tasks/main.yml

diff --git a/tasks/main.yml b/tasks/main.yml
index b3fccf9..0bd0537 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -1,5 +1,10 @@
 ---
 # tasks file for apigee-opdk-extension-ds
+- name: Nodetool cleanup before flush
+  shell: '{{ nodetool }} cleanup'
+  environment:
+    JAVA_HOME: '{{ java_home }}'
+
 - name: Nodetool flush before repair
   shell: '{{ nodetool }} flush'
   environment: