diff --git a/rest-api-spec/api/count.json b/rest-api-spec/api/count.json
index f20a31ad98d..8f8a3950539 100644
--- a/rest-api-spec/api/count.json
+++ b/rest-api-spec/api/count.json
@@ -26,9 +26,6 @@
           "type" : "number",
           "description" : "Include only documents with a specific `_score` value in the result"
         },
-        "operation_threading": {
-          "description" : "TODO: ?"
-        },
         "preference": {
           "type" : "string",
           "description" : "Specify the shards the operation should be performed on (default: random shard)"
diff --git a/rest-api-spec/api/search.json b/rest-api-spec/api/search.json
index 33a4546555f..f2f62bf1648 100644
--- a/rest-api-spec/api/search.json
+++ b/rest-api-spec/api/search.json
@@ -64,9 +64,6 @@
           "type" : "boolean",
           "description" : "Specify whether query terms should be lowercased"
         },
-        "operation_threading": {
-          "description" : "TODO: ?"
-        },
         "preference": {
           "type" : "string",
           "description" : "Specify the shards the operation should be performed on (default: random shard)"
diff --git a/rest-api-spec/api/suggest.json b/rest-api-spec/api/suggest.json
index 2f7b8de90d3..023a79f2542 100644
--- a/rest-api-spec/api/suggest.json
+++ b/rest-api-spec/api/suggest.json
@@ -18,9 +18,6 @@
           "default" : "none",
           "description" : "When performed on multiple indices, allows to ignore `missing` ones"
         },
-        "operation_threading": {
-          "description" : "TODO: ?"
-        },
         "preference": {
           "type" : "string",
           "description" : "Specify the shards the operation should be performed on (default: random shard)"