curl -X POST https://api.box.com/2.0/files/12345 \
     -H 'Authorization: Bearer <ACCESS_TOKEN>'
     -H 'Content-Type: application/json'
     -d '{    
       "from": "enterprise_123456.contractTemplate",    
       "query": "amount >= :value",    
       "query_params": {        
         "value": 100    
       },    
       "ancestor_folder_id": "5555",    
       "use_index": "amountAsc",    
       "order_by": [  
         {
           "field_key": "amount",
           "direction": "asc"
         }
       ],    
       "limit": 100
     }'

String from = "enterprise_341532.test";
String query = "testfield = :arg";
String ancestorFolderId = "0";
JsonObject queryParameters = new JsonObject().add("arg", "test");
JsonArray orderBy = new JsonArray();
JsonObject primaryOrderBy = new JsonObject().add("field_key", "primarySortKey").add("direction", "asc");
JsonObject secondaryOrderBy = new JsonObject().add("field_key", "secondarySortKey").add("direction",
    "asc");
orderBy.add(primaryOrderBy).add(secondaryOrderBy);

BoxResourceIterable<BoxMetadataQueryItem> results = MetadataTemplate.executeMetadataQuery(api, from, query, queryParameters, ancestorFolderId, null, orderBy);
for (BoxMetadataQueryItem r: results) {
  String customFieldValue = r.getMetadata().get("enterprise_341532").get(0).get("/customField");
  System.out.println(customFieldValue);
}

var from = 'enterprise_12345.someTemplate',
	ancestorFolderId = '5555',
	options = {
		query: 'amount >= :arg',
		queryParams: {
			arg: 100
		},
		useIndex: 'amountAsc',
		orderBy: [
			{
				field_key: 'amount',
				direction: 'asc'
			}
		],
		limit: 100,
		marker: 'AAAAAmVYB1FWec8GH6yWu2nwmanfMh07IyYInaa7DZDYjgO1H4KoLW29vPlLY173OKsci6h6xGh61gG73gnaxoS+o0BbI1/h6le6cikjlupVhASwJ2Cj0tOD9wlnrUMHHw3/ISf+uuACzrOMhN6d5fYrbidPzS6MdhJOejuYlvsg4tcBYzjauP3+VU51p77HFAIuObnJT0ff'
	};
client.metadata.query(from, ancestorFolderId, options)
	.then(items => {
		/* items -> {
			"entries": [
			{
				"item": {
					"type": "file",
					"id": "1617554169109",
					"file_version": {
						"type": "file_version",
						"id": "1451884469385",
						"sha1": "69888bb1bff455d1b2f8afea75ed1ff0b4879bf6"
					},
					"sequence_id": "0",
					"etag": "0",
					"sha1": "69888bb1bff455d1b2f8afea75ed1ff0b4879bf6",
					"name": "My Contract.docx",
					"description": "",
					"size": 25600,
					"path_collection": {
						"total_count": 4,
						"entries": [
						{
							"type": "folder",
							"id": "0",
							"sequence_id": null,
							"etag": null,
							"name": "All Files"
						},
						{
							"type": "folder",
							"id": "15017998644",
							"sequence_id": "0",
							"etag": "0",
							"name": "Contracts"
						},
						{
							"type": "folder",
							"id": "15286891196",
							"sequence_id": "1",
							"etag": "1",
							"name": "North America"
						},
						{
							"type": "folder",
							"id": "16125613433",
							"sequence_id": "0",
							"etag": "0",
							"name": "2017"
						}
						]
					},
					"created_at": "2017-04-20T12:55:27-07:00",
					"modified_at": "2017-04-20T12:55:27-07:00",
					"trashed_at": null,
					"purged_at": null,
					"content_created_at": "2017-01-06T17:59:01-08:00",
					"content_modified_at": "2017-01-06T17:59:01-08:00",
					"created_by": {
						"type": "user",
						"id": "193973366",
						"name": "Box Admin",
						"login": "admin@company.com"
					},
					"modified_by": {
						"type": "user",
						"id": "193973366",
						"name": "Box Admin",
						"login": "admin@company.com"
					},
					"owned_by": {
						"type": "user",
						"id": "193973366",
						"name": "Box Admin",
						"login": "admin@company.com"
					},
					"shared_link": null,
					"parent": {
						"type": "folder",
						"id": "16125613433",
						"sequence_id": "0",
						"etag": "0",
						"name": "2017"
					},
					"item_status": "active"
				},
				"metadata": {
					"enterprise_123456": {
						"someTemplate": {
						"$parent": "file_161753469109",
						"$version": 0,
						"customerName": "Phoenix Corp",
						"$type": "someTemplate-3d5fcaca-f496-4bb6-9046-d25c37bc5594",
						"$typeVersion": 0,
						"$id": "ba52e2cc-371d-4659-8d53-50f1ac642e35",
						"amount": 100,
						"claimDate": "2016-04-10T00:00:00Z",
						"region": "West",
						"$typeScope": "enterprise_123456"
						}
					}
				}
			}
			],
			"next_marker": ""
		}
		*/
	});