Use synonym index alias, add timeout

Author: carlosdelest

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/synonyms/60_synonym_rule_get.yml

@@ -15,7 +15,8 @@ setup:
               id: "test-id-3"
   - do:
       cluster.health:
-        index: .synonyms-2
+        index: .synonyms
+        timeout: 1m
         wait_for_status: green
 
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