1) Mongoid::Criteria#geo_near returns the matching documents
     Failure/Error: @results ||= client.command(command).first
     
     Mongo::Error::OperationFailure:
       no such command: 'geoNear' (59)
     # ./lib/mongoid/contextual/geo_near.rb:263:in `results'
     # ./lib/mongoid/contextual/geo_near.rb:245:in `documents'
     # ./lib/mongoid/contextual/geo_near.rb:39:in `each'
     # ./lib/mongoid/contextual/geo_near.rb:10:in `entries'
     # ./lib/mongoid/contextual/geo_near.rb:10:in `=='
     # ./spec/mongoid/criteria_spec.rb:1009:in `block (3 levels) in <top (required)>'

                                                                                                                                           
  2) Mongoid::Criteria#max_scan executes the criteria while properly giving the max scan to Mongo
     Failure/Error: super
     
     Mongo::Error::OperationFailure:
       Failed to parse: { find: "bands", filter: {}, maxScan: 1, $db: "mongoid_test", $clusterTime: { clusterTime: Timestamp(1547443824, 16), signature: { hash: BinData(0, 0000000000000000000000000000000000000000), keyId: 0 } }, lsid: { id: UUID("2ca9b8a0-2a88-48cc-a38f-a61be03f99a0") } }. Unrecognized field 'maxScan'. (9)
     # ./lib/mongoid/query_cache.rb:224:in `each'
     # ./lib/mongoid/contextual/mongo.rb:134:in `each'
     # ./lib/mongoid/contextual.rb:21:in `each'
     # ./spec/mongoid/criteria_spec.rb:3354:in `to_a'
     # ./spec/mongoid/criteria_spec.rb:3354:in `block (3 levels) in <top (required)>'