[TEST] Cross Cluster Search: specify index name when creating role (elastic/x-pack-elasticsearch#1208)

This makes sure that the user needs to have access only to the specific index that needs to be accessed on the remote clusters.

relates to elastic/x-pack-elasticsearch#1153

Original commit: elastic/x-pack-elasticsearch@7966416bd7

qa/multi-cluster-search-security/src/test/resources/rest-api-spec/test/multi_cluster/10_basic.yaml

@@ -22,7 +22,7 @@ setup:
               "cluster": ["all"],
               "indices": [
                 {
-                  "names": "*",
+                  "names": ["test_index", "my_remote_cluster:test_index", "my_remote_cluster:aliased_test_index", "test_remote_cluster:test_index"],
                   "privileges": ["read", "read_cross_cluster", "view_index_metadata"]
                 }
               ]

qa/multi-cluster-search-security/src/test/resources/rest-api-spec/test/remote_cluster/10_basic.yaml

@@ -22,7 +22,7 @@ setup:
               "cluster": ["monitor"],
               "indices": [
                 {
-                  "names": "*",
+                  "names": ["test_index", "aliased_test_index"],
                   "privileges": ["read", "read_cross_cluster", "view_index_metadata"]
                 }
               ]