Upgrade docs

Kunstmaan · Jun 25, 2020 · b4cb1ff · b4cb1ff
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 UPGRADE FROM 5.5 to 5.6
 =======================
+
+General
+-------
+
+SearchBundle/NodeSearchBundle: Support for ruflin/elastica and elasticasearch 7 was added. If you still use 
+elasticsearch 6 you should add `"ruflin/elastica": "^5.0|^6.0"` to your project `composer.json`.
+
+SearchBundle
+------------
+
+Support for `ruflin/elastica` and elasticsearch versions below 7 is deprecated and will be removed in 6.0. Upgrade to `ruflin/elastica` ^7.0 and elasticsearch 7.