### 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boolean property, as well as the `expiration` property that contains the UNIX timestamp past of which the key is no longer valid for authentication.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
server/src/main/java/org/elasticsearch/TransportVersion.java
+ "] have the same version number ["
                            + version.id
                            + "]. Each TransportVersion should have a different version number";
                }
            }
        }
        return Collections.unmodifiableNavigableMap(builder);
    }
    private static final NavigableMap<Integer, TransportVersion> VERSION_IDS = getAllVersionIds(TransportVersion.class);
    static Collection<TransportVersion> getAllVersions() {
        return VERSION_IDS.values();
    }
    public static TransportVersion readVersion(StreamInput in) throws IOException {
        return fromId(in.readVInt());
    }
    public static TransportVersion fromId(int id) {
        TransportVersion known = VERSION_IDS.get(id);
        if (known != null) {
            return known;
        }
        
        return new TransportVersion(id);
    }
    public static void writeVersion(TransportVersion version, StreamOutput out) throws IOException {
        out.writeVInt(version.id);
    }
    /**
     * Returns the minimum version of {@code version1} and {@code version2}
     */
    public static TransportVersion min(TransportVersion version1, TransportVersion version2) {