Github user kxepal commented on a diff in the pull request:

    https://github.com/apache/couchdb-couch-index/pull/18#discussion_r75572589
  
    --- Diff: src/couch_index.erl ---
    @@ -344,25 +340,19 @@ handle_info({'DOWN', _, _, _Pid, _}, #st{mod=Mod, 
idx_state=IdxState}=State) ->
         Args = [Mod:get(db_name, IdxState), Mod:get(idx_name, IdxState)],
         couch_log:info("Index shutdown by monitor notice for db: ~s idx: ~s", 
Args),
         catch send_all(State#st.waiters, shutdown),
    -    {stop, normal, State#st{waiters=[]}}.
    -
    +    {stop, normal, State#st{waiters=[]}};
    +handle_info({config_change, "query_server_config", "commit_freq", 
NewDelay, _}, State) ->
    +    handle_cast({config_change, NewDelay}, State);
    +handle_info({gen_event_EXIT, _Handler, _Reason}, State) ->
    +    erlang:send_after(?RELISTEN_DELAY, self(), restart_config_listener),
    +    {noreply, State};
    +handle_info(restart_config_listener, State) ->
    +    ok = config:subscribe_for_changes([{"query_server_config", 
"commit_freq"}]),
    --- End diff --
    
    Feels like if we have a single place where we do subscribe for certain 
config keys will save us from mistakes, when we forgot to update a second 
`config:subscribe_for_changes` call. Or at least if we'll use `define` for what 
we subscribe.


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