Clarify documentation for FastVectoryHighlighter.
Fix 404 Link
Merge pull request #496 from armetiz/patch-2

Fix 404 Link
Added missing parenthesis
Added note about default search type
Fix small typo
Create CONTRIBUTING.md
Update cluster update settings and indices update settings APIs
Fix incorrect default values for BalancedShardsAllocator
Add Git River Plugin
Merge pull request #502 from obazoud/river-git

Add Git River Plugin
Add warnings about the usage of `ignore_unmapped` with cross-indices search requests.
Added the info about clearing the ID cache (parent/child)
Clarify information about how caches are cleared by default
function score documentation
Fixed field data regex filter settings
All fields now support missing values.
Added doc for human flag

Closes #498
Added fuzzy completion suggest options
add date field to function score doc