[debug] 2018-07-20T08:37:20.087523Z couchdb@127.0.0.1 <0.12655.0> 856ac97ffa cache hit for <user>
[error] 2018-07-20T08:37:20.089985Z couchdb@127.0.0.1 <0.12655.0> 856ac97ffa req_err(278200450) unknown_error : undef
    [<<"chttpd:send_error/6">>,<<"chttpd:process_request/1 L295">>,<<"chttpd:handle_request_int/1 L231">>,<<"mochiweb_http:headers/6 L91">>,<<"proc_lib:init_p_do_apply/3 L240">>]
[notice] 2018-07-20T08:37:20.090434Z couchdb@127.0.0.1 <0.12655.0> 856ac97ffa <host> <IP> undefined POST /<dbname>/_index?_nonce=1532075839986 500 ok 3