Dashboard msearch request body is not sorted

[shaharmor]

Kibana version: 4.6.2

Elasticsearch version: 2.4.3

Server OS version: Ubuntu 14.04

Browser version: Chrome 55

Browser OS version: MacOSX

Original install method (e.g. download page, yum, from source, etc.): apt-get

Description of the problem including expected versus actual behavior:
When Kibana is making a request for a dashboard to the _msearch endpoint, the POST request body is not sorted, which makes it harder to cache, for someone who is using a caching layer between Kibana & ES.

Steps to reproduce:

1. create a dashboard with multiple visualizations
2. set a static time range
3. refresh the dashboard page multiple time and observe the network pane for the msearch request body

[shaharmor]

Any update on this?

[timroes]

We are currently in the process of redesigning/reimplementing the Courier service, which does the central requests. I would close this in favor of #34022.