Indexing creates an index instead of the expected alias

[kdambekalns]

When running nodeindex:build and no indexes exist at all, an index named foo-postfix is created. But instead of an alias foo pointing to that, an actual index foo is created and filled with data.

This leads to at least two problems:

• when aliases are about to be switched the next time, an error occurs, since the alias (that isn't an alias) cannot be deleted
• mapping is not as expected but built dynamically (see Use flattened field type instead of object for neos_fulltext_parts #356)

[kdambekalns]

Observations so far, when no indices exist:

• nodeindex:indexnode without the --postfix option creates a postfix-less index and no alias
• used with --postfix it creates an index with the given postfix, but does not create an alias as I'd expect

[kdambekalns]

Conclusion:

• nodeindex:indexnode without --postfix should use an existing alias or create a new postfix (like nodeindex:build does) and set up the alias
• nodeindex:indexnode with --postfix given should use that postfix and not change the alias, as that's probably intended when passing the postfix manually

Exptected aliases for index name foo-fb11fdde869d0a8fcfe00a2fd35c031d-1612539561':

• foo
• foo-1612539561
• foo-fb11fdde869d0a8fcfe00a2fd35c031d

[kdambekalns]

More observations: nodeindex:build does not set up aliases after creating fresh indexes until it deems the indexing complete. This is good, usually, since it allows for indexing "in the background", but obviously if no aliases exist at all, this is going to break:

beach@a4ca46c09d26:/application$ ./flow nodeindex:build --limit 1 --workspace live
Creating indices and apply mapping... Done (took 16.48 seconds)
Indexing nodes...   + Workspace "live" and dimensions "{"language":["en"]}" done. (Indexed 2 nodes)
+ Workspace "live" and dimensions "{"language":["de","en"]}" done. (Indexed 2 nodes)
Done (took 3.66 seconds)
Refresh indicies... Done (took 1.50 seconds)
Update aliases...   Elasticsearch request failed:
[POST http://:@acmecom_elasticsearch:9200/_aliases]: Array
(
    [root_cause] => Array
        (
            [0] => Array
                (
                    [type] => invalid_alias_name_exception
                    [reason] => Invalid alias name
[acmecom-e781f29c8dd927c09735547a848e3459], an index exists with the
same name as the alias
                    [index_uuid] => V8fA1j8pRVikhO-QsLHsPA
                    [index] => acmecom-e781f29c8dd927c09735547a848e3459
                )

        )

    [type] => invalid_alias_name_exception
    [reason] => Invalid alias name
[acmecom-e781f29c8dd927c09735547a848e3459], an index exists with the
same name as the alias
    [index_uuid] => V8fA1j8pRVikhO-QsLHsPA
    [index] => acmecom-e781f29c8dd927c09735547a848e3459
)