* Add kibana5 and logstash5
* Upgrade the elastic beats to 5.4
* Make sure all elastic products use the same version
(see elk5Version)
* Add a test for the ELK stack
Note: the option to configure the watchdog timeout seems to be gone
in the 2.3 series of Logstash. It complains about an unknown option
and it is not in the source anymore. I am thus removing this
configuration option to adjust the service to these changes, too.
- add missing types in module definitions
- add missing 'defaultText' in module definitions
- wrap example with 'literalExample' where necessary in module definitions
Using pkgs.lib on the spine of module evaluation is problematic
because the pkgs argument depends on the result of module
evaluation. To prevent an infinite recursion, pkgs and some of the
modules are evaluated twice, which is inefficient. Using ‘with lib’
prevents this problem.
