AWS Pinpoint custom attribute - the value of 'true'”改写为“AWS Pinpoint自定义属性 - 值为'true'”，可通过以下代码实现：

Map customAttributes = new HashMap<>();
customAttributes.put("myCustomAttribute", true);
Map endpointAttributes = new HashMap<>();
endpointAttributes.put("Attributes", customAttributes);
UpdateEndpointRequest request = new UpdateEndpointRequest()
    .withApplicationId("YOUR_APP_ID")
    .withEndpointId("YOUR_ENDPOINT_ID")
    .withEndpointRequest(endpointAttributes);
UpdateEndpointResult result = PinpointClientBuilder.standard()
    .withRegion(Regions.US_EAST_1)
    .build()
    .updateEndpoint(request);