Docs: Fixed bad asciidoc link

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

@@ -101,7 +101,7 @@ Just as in {ref}/docs-update.html[Update API] you can set `ctx.op = "noop"` if
 your script decides that it doesn't have to make any changes. That will cause
 `_update_by_query` to omit that document from its updates. Setting `ctx.op` to
 anything else is an error. If you want to delete by a query you can use the
-{plugins}/delete-by-query.html[Delete by Query plugin] instead. Setting any 
+{plugins}/plugins-delete-by-query.html[Delete by Query plugin] instead. Setting any
 other field in `ctx` is an error.
 
 Note that we stopped specifying `conflicts=proceed`. In this case we want a