merge

Issue #3532: Add note about AR default values to upgrade notes

I think it's better to enclose `$key` as function parameter.

Hide output in LinkPager when only one page exist

[WIP] #3527 Improving Elasticsearch extension

#3522 normalizepath to allow current path

Conflicts:
	framework/CHANGELOG.md

Fix #3531, allow more chars in \yii\grid\GridView's short syntax for columns.

Update security-authorization.md

Typo

typo