[DOCS] Placeholder for synonym APIs (#97063)

docs/reference/redirects.asciidoc

@@ -1880,4 +1880,34 @@ Refer to <<example-watches>> for other Watcher examples.
 [role="exclude",id="disk-usage-exceeded"]
 === Fix watermark errors
 
-Refer to <<fix-watermark-errors>>.
+Refer to <<fix-watermark-errors>>.
+
+[role="exclude",id="get-synonym-rule"]
+=== Get synonym rule API
+
+coming::[8.10.0]
+
+[role="exclude",id="get-synonyms"]
+=== Get synonym set API
+
+coming::[8.10.0]
+
+[role="exclude",id="list-synonyms"]
+=== List synonym sets API
+
+coming::[8.10.0]
+
+[role="exclude",id="put-synonym-rule"]
+=== Create or update synonym rule API
+
+coming::[8.10.0]
+
+[role="exclude",id="delete-synonyms"]
+=== Delete synonym sets API
+
+coming::[8.10.0]
+
+[role="exclude",id="put-synonyms"]
+=== Create or update synonym sets API
+
+coming::[8.10.0]