Major Description
CloudSolrClient uses _route_ to know where to send a request It sorta works – it'll go to an appropriate node. But it will only go to the correct core on that node if the collection parameter is explicitly added. In another words, it ignores the default collection configured on CloudSolrClient. It also seems to ignore "collection" parameter to the protected method sendRequest for this purpose too. As I write this, see line 1139 on master.