EZP-23329: hint read-only property
EZP-23329: first implementation of Elasticsearch storage
Move SPI\Persistence\Search to SPI\Search

Conflicts:
	eZ/Publish/Core/Persistence/Cache/LocationSearchHandler.php
	eZ/Publish/Core/Persistence/Legacy/Content/Search/Location/Handler.php
Deprecate SPI\Persistence\Handler search functions