I'm trying to retrieve the thresholds for a match in cloud code.

To reproduce, just create any match with the shortCode "TEST", then run the following code:

{
  "_id": {
    "$oid": "5aba5ef3dc00a804fb5f53bf"
  },
  "script": "MatchmakingRequest",
  "playerId": "5ab9000d6d5542d6fcab8fb2",
  "log": {
    "stackTrace": "\tat request/MatchmakingRequest.js:32\n",
    "error": "Access to Java class \"java.util.ArrayList\" is prohibited. (request/MatchmakingRequest.js#32)",
    "script": "MatchmakingRequest"
  },
  "level": "FATAL",
  "ts": {
    "$date": {
      "$numberLong": "1522163443998"
    }
  }
}

var matchConfigs = Spark.getMultiplayer().getMatchConfig("TEST");
var thresholds = matchConfigs.getThresholds();

 This results in a Java exception:

{
  "_id": {
    "$oid": "5aba5ef3dc00a804fb5f53bf"
  },
  "script": "MatchmakingRequest",
  "playerId": "5ab9000d6d5542d6fcab8fb2",
  "log": {
    "stackTrace": "\tat request/MatchmakingRequest.js:32\n",
    "error": "Access to Java class \"java.util.ArrayList\" is prohibited. (request/MatchmakingRequest.js#32)",
    "script": "MatchmakingRequest"
  },
  "level": "FATAL",
  "ts": {
    "$date": {
      "$numberLong": "1522163443998"
    }
  }
}