Some types of audit event samples from [our documentation](https://www.elastic.co/guide/en/elasticsearch/reference/7.17/audit-event-types.html) include the port number in "origin.address", like **access_denied**:
```json
{"type":"audit", "timestamp":"2020-12-30T22:30:06,949+0200", "node.id":
"0RMNyghkQYCc_gVd1G6tZQ", "event.type":"transport", "event.action":
"access_denied", "authentication.type":"REALM", "user.name":"user1",
"user.realm":"default_native", "user.roles":["test_role"], "origin.type":
"rest", "origin.address":"[::1]:52434", "request.id":"yKOgWn2CRQCKYgZRz3phJw",
"action":"indices:admin/auto_create", "request.name":"CreateIndexRequest",
"indices":["<index-{now/d+1d}>"]}
```
but other types like **connection_denied** from this issue does not include the port:

```json
{"type":"audit", "timestamp":"2020-12-30T21:47:31,526+0200", "node.id":
"0RMNyghkQYCc_gVd1G6tZQ", "event.type":"ip_filter", "event.action":
"connection_denied", "origin.type":"rest", "origin.address":"10.10.0.20",
"transport.profile":".http", "rule":"deny 10.10.0.0/16"}
```

I think we should be consistent here and always include the port number in the "origin.address" field.
x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/audit/logfile/LoggingAuditTrail.java
public static final String CREATE_CONFIG_FIELD_NAME = "create";
    public static final String INVALIDATE_API_KEYS_FIELD_NAME = "invalidate";
    public static final String NAME = "logfile";
    public static final Setting<Boolean> EMIT_HOST_ADDRESS_SETTING = Setting.boolSetting(
        setting("audit.logfile.emit_node_host_address"),
        false,
        Property.NodeScope,
        Property.Dynamic
    );
    public static final Setting<Boolean> EMIT_HOST_NAME_SETTING = Setting.boolSetting(
        setting("audit.logfile.emit_node_host_name"),
        false,
        Property.NodeScope,
        Property.Dynamic
    );
    public static final Setting<Boolean> EMIT_NODE_NAME_SETTING = Setting.boolSetting(
        setting("audit.logfile.emit_node_name"),
        false,
        Property.NodeScope,
        Property.Dynamic
    );
    public static final Setting<Boolean> EMIT_NODE_ID_SETTING = Setting.boolSetting(
        setting("audit.logfile.emit_node_id"),
        true,
        Property.NodeScope,
        Property.Dynamic
    );
    public static final Setting<Boolean> EMIT_CLUSTER_NAME_SETTING = Setting.boolSetting(
        setting("audit.logfile.emit_cluster_name"),
        false,