timout parameter doesn't work with search

[mmll]

Describe the feature:

Elasticsearch version (bin/elasticsearch --version):5.2.2

Plugins installed: []

JVM version (java -version): 1.8.0_121

OS version (uname -a if on a Unix-like system): opensuse

Description of the problem including expected versus actual behavior:

Steps to reproduce:

Please include a minimal but complete recreation of the problem, including
(e.g.) index creation, mappings, settings, query etc. The easier you make for
us to reproduce it, the more likely that somebody will take the time to look at it.

1. Do search with " curl -XGET 'localhost:9200/_search?pretty&timeout=1ms' "
2. The part of response is :
   {
   "took" : 5,
   "timed_out" : false,
   "_shards" : {
   "total" : 208,
   "successful" : 208,
   "failed" : 0
   },
   "hits" : {
   "total" : 104429,
   "max_score" : 1.0,
   "hits" :
   ...
3. The took time is 5ms, and timeout setting is 1ms. Why "timed_out" is false rather than true.

Provide logs (if relevant):

[jasontedor]

Timeout only refers to the execution time of the search on the shard, it does not account for the total service time (time in the queue, time parsing the query, time rendering the response, etc.).