Backport: doc changes in elastic#2953, elastic#3002, elastic#3010, el…

…astic#3036, elastic#3041 (elastic#3043)

* Add consulbeat (elastic#2953)

* Add redditbeat to community beats list

* Improve "pipelines" documentation

Mention the similarity to the "indices" array and add an example.

* Default docs update for filbeat

* Default docs for close_eof and close_timeout added
* Remove note for logstash-forward based code
* Updated output docs as elasticsearch can now also be used for parsing (ingest)

* Show download link to dashboards

Docs: Fix path for beats-dir

Backport doc changes into 5.0 (elastic#2847)

* Clarify instructions for running configtest

* Add to FAQ the solution for having nested JSON objects under Discovery (elastic#2726)

* docs: Fix broken Kibana doc link in faq (elastic#2837)

The Kibana docs overhaul for 5.0+ changed the link to the index pattern
field refresh instructions.

* Use variable for filepath plus some light edits (elastic#2838)

Merge pull request elastic#2724 from tsg/backport_2631

Backport 2631: Breaking changes guide + fixes

Merge pull request elastic#2601 from tsg/fix_import_dashbaords_win

Fix import_dashboards script name on Windows

Merge pull request elastic#2550 from tsg/fix_changelog_1.3

Fixed changelog in 1.3 branch

Remove note about Npcap being (elastic#2404)

fix broken link to ingest docs (elastic#2173)

Docs version bump to alpha4 (elastic#1939)

To be merged shortly before the release.

Remove topbeat references from the doc (elastic#1777)

* Remove topbeat references from the doc

* Add variables for metricbeat