[TEST] escape brackets

Relates to #35496

Author: martijnvg

docs/reference/ccr/apis/get-ccr-stats.asciidoc

@@ -105,7 +105,7 @@ The API returns the following results:
     "number_of_failed_follow_indices" : 0,
     "number_of_failed_remote_cluster_state_requests" : 0,
     "number_of_successful_follow_indices" : 1,
-    "recent_auto_follow_errors" : [ ]
+    "recent_auto_follow_errors" : []
   },
   "follow_stats" : {
     "indices" : [
@@ -150,7 +150,7 @@ The API returns the following results:
 // TESTRESPONSE[s/"number_of_failed_follow_indices" : 0/"number_of_failed_follow_indices" : $body.auto_follow_stats.number_of_failed_follow_indices/]
 // TESTRESPONSE[s/"number_of_failed_remote_cluster_state_requests" : 0/"number_of_failed_remote_cluster_state_requests" : $body.auto_follow_stats.number_of_failed_remote_cluster_state_requests/]
 // TESTRESPONSE[s/"number_of_successful_follow_indices" : 1/"number_of_successful_follow_indices" : $body.auto_follow_stats.number_of_successful_follow_indices/]
-// TESTRESPONSE[s/"recent_auto_follow_errors" : [ ]/"recent_auto_follow_errors" : $body.auto_follow_stats.recent_auto_follow_errors/]
+// TESTRESPONSE[s/"recent_auto_follow_errors" : \[\]/"recent_auto_follow_errors" : $body.auto_follow_stats.recent_auto_follow_errors/]
 // TESTRESPONSE[s/"leader_global_checkpoint" : 1024/"leader_global_checkpoint" : $body.follow_stats.indices.0.shards.0.leader_global_checkpoint/]
 // TESTRESPONSE[s/"leader_max_seq_no" : 1536/"leader_max_seq_no" : $body.follow_stats.indices.0.shards.0.leader_max_seq_no/]
 // TESTRESPONSE[s/"follower_global_checkpoint" : 768/"follower_global_checkpoint" : $body.follow_stats.indices.0.shards.0.follower_global_checkpoint/]