unloadwallet ( "wallet_name" load_on_startup )

Unloads the wallet referenced by the request endpoint otherwise unloads the wallet specified in the argument.
Specifying the wallet name on a wallet endpoint is invalid.
1. wallet_name        (string, optional, default=the wallet name from the RPC request) The name of the wallet to unload.
2. load_on_startup    (boolean, optional, default=null) Save wallet name to persistent settings and load on startup. True to add wallet to startup list, false to remove, null to leave unchanged.

{                       (json object)
  "warning" : "str"     (string) Warning message if wallet was not unloaded cleanly.

> bitcoin-cli unloadwallet wallet_name
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "unloadwallet", "params": [wallet_name]}' -H 'content-type: text/plain;'