With 5.6 a new search engine utilizing Elastic search has been released this has an impact on the usage in Media Manager and brings a larger feature set.
The impact on updates are the following
Elastic search must be installed and/or configured locally or in the cloud - see documentation
Filters for the MediaManager must be re-configured - see documentation
Freetext search in MediaManager must be re-configured - see documentation
Custom sort options on clients must be re-configured - see documentation
On top of that it also it also expands the feature set with the following features
Excluding facets
Recursive tree searches
Improved free text searching capabilities - see Elastic search documentation
Dependent filters based of dependent metadata setup
Improved performance on indexing