The doc at:
https://doc.ez.no/display/EZP/Solr+Search+Engine+Bundle
needs to be updated on regards of recently changed path:

the path of the schema is now located at:

vendor/ezsystems/ezplatform-solr-search-engine/lib/Resources/config/solr/*

Also, for instance, 5.4 doesn't yet contain the configuration to read the Solr parameters from parameters.solr. Although this is not an issue itself, I believe it could just be adapted to how it currently is, to minimize differences.