Replace refresh with cluster.health check

Possible to fail this test with a 500 NoShardsAvailable error, due
to the index not being fully allocated before the analyze call is
executed.

Changing for a wait_for_status: yellow fixes the occasional problem.

rest-api-spec/test/indices.analyze/10_analyze.yaml

@@ -41,6 +41,10 @@
 
 ---
 "Analyze API JSON format - index and field":
+    - do:
+        cluster.health:
+          wait_for_status: yellow
+
     - do:
         indices.analyze:
           field: text