[docs] Fix bad link in reindex docs

docs/reference/docs/reindex.asciidoc

@@ -277,7 +277,7 @@ POST /_reindex
 --------------------------------------------------
 // AUTOSENSE
 
-Reindex can also use the link:ingest.html[Ingest] feature by specifying a
+Reindex can also use the <<ingest>> feature by specifying a
 `pipeline` like this:
 
 [source,js]

docs/reference/docs/update-by-query.asciidoc

@@ -138,7 +138,7 @@ POST /twitter/_update_by_query?scroll_size=1000
 --------------------------------------------------
 // AUTOSENSE
 
-`_update_by_query` can also use the link:ingest.html[Ingest] feature by
+`_update_by_query` can also use the <<ingest>> feature by
 specifying a `pipeline` like this:
 
 [source,js]