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
builder.array("privileges", indicesPrivileges.getPrivileges());
            if (indicesPrivileges.isUsingFieldLevelSecurity()) {
                builder.startObject(RoleDescriptor.Fields.FIELD_PERMISSIONS.getPreferredName());
                
                
                builder.array(RoleDescriptor.Fields.GRANT_FIELDS.getPreferredName(), indicesPrivileges.getGrantedFields());
                if (indicesPrivileges.hasDeniedFields()) {
                    builder.array(RoleDescriptor.Fields.EXCEPT_FIELDS.getPreferredName(), indicesPrivileges.getDeniedFields());
                }
                builder.endObject();
            }
            if (indicesPrivileges.isUsingDocumentLevelSecurity()) {
                builder.field("query", indicesPrivileges.getQuery().utf8ToString());
            }
            
            if (indicesPrivileges.allowRestrictedIndices()) {
                builder.field("allow_restricted_indices", indicesPrivileges.allowRestrictedIndices());
            }
            builder.endObject();
        }
        LogEntryBuilder withRequestBody(DeleteUserRequest deleteUserRequest) throws IOException {
            logEntry.with(EVENT_ACTION_FIELD_NAME, "delete_user");
            XContentBuilder builder = JsonXContent.contentBuilder().humanReadable(true);
            builder.startObject()
                .startObject("user")
                .field("name", deleteUserRequest.username())
                .endObject() 
                .endObject();
            logEntry.with(DELETE_CONFIG_FIELD_NAME, Strings.toString(builder));
            return this;