### Description

The [Get API key information API](https://www.elastic.co/guide/en/elasticsearch/reference/master/security-api-get-api-key.html) can currently filter the returned keys by:
 * key id/name
 * keys owned by the calling user
 * keys owned by other users, by `realm_name` and `username`

Irrespective of the filtering used, both invalidated and expired (but not yet deleted) keys will be included in the response.
In the response, keys have the `invalidated` boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.

I propose we introduce a way for the API to support retrieving:
* only valid API keys (not return invalidated keys) - using a boolean request parameter
* keys not expired before a certain timestamp - using a timestamp parameter that defaults to "now" - also note that keys' experiation date is always checked against the local node's clock
x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authc/ApiKeyServiceTests.java
EsExecutors.TaskTrackingConfig.DO_NOT_TRACK
                )
            )
        );
    }
    @After
    public void stopThreadPool() {
        terminate(threadPool);
    }
    @Before
    public void setupMocks() {
        this.client = mock(Client.class);
        this.securityIndex = SecurityMocks.mockSecurityIndexManager();
        this.cacheInvalidatorRegistry = mock(CacheInvalidatorRegistry.class);
        
        clock = mock(Clock.class);
        doAnswer(invocation -> Instant.now()).when(clock).instant();
    }
    public void testCreateApiKeyUsesBulkIndexAction() throws Exception {
        final Settings settings = Settings.builder().put(XPackSettings.API_KEY_SERVICE_ENABLED_SETTING.getKey(), true).build();
        final ApiKeyService service = createApiKeyService(settings);
        final Authentication authentication = AuthenticationTestHelper.builder()
            .user(new User("alice", "superuser"))
            .realmRef(new RealmRef("file", "file", "node-1"))
            .build(false);
        final CreateApiKeyRequest createApiKeyRequest = new CreateApiKeyRequest("key-1", null, null);
        when(client.prepareIndex(anyString())).thenReturn(new IndexRequestBuilder(client, IndexAction.INSTANCE));
        when(client.prepareBulk()).thenReturn(new BulkRequestBuilder(client, BulkAction.INSTANCE));
        when(client.threadPool()).thenReturn(threadPool);
        final AtomicBoolean bulkActionInvoked = new AtomicBoolean(false);