Migrate a MongoDB collection from one instance to another, over network and with compression:

  $ mongoexport --collection <col> --db <db> \
    --uri "mongodb://<user>:<password>@<host>:<port>/?authSource=admin&readPreference=primary&ssl=false&directConnection=true" \
    2> log_mongoexport.txt \
    | bzip2 \
    | ssh <ssh-alias> "bzip2 -dc \
    | mongoimport --drop --collection <col> --db <db> \
    --uri 'mongodb://<user>:<password>@<host>:<port>/?authSource=admin&readPreference=primary&ssl=false&directConnection=true'" \