Process Manager always exits successfully if the amount of functions(i.e. indexer dimensions) is lower than the MAGE_INDEXER_THREADS_COUNT env variable

[pawel-siejba]

Process Manager always exits successfully if the amount of functions passed to it(i.e. indexer dimensions) is lower than the MAGEINDEXER_THREADSCOUNT env variable. Can cause the Index to think it was rebuilt successfully when in fact it wasn't.

Preconditions (*)

1. Magento 2.3.0 CE/EE or higher
2. Magento 2.4-develop
3. Several stores are active, but less than MAGEINDEXER_THREADS_COUNT(if MAGE_INDEXER_THREADSCOUNT=4, then the amount of stores active to reproduce this bug can be 3).
4. (Optional) Elasticsearch is configured as search_engine - for ease of reproducing

Steps to reproduce (*)

1. Run MAGE*INDEXER_THREADS_COUNT=4 php bin/magento indexer:reindex catalogsearch*fulltext
2. Kill Elasticsearch process to simulate an exception thrown

Expected result (*)

1. Main process exits with an error as child process failed.

Actual result (*)

1. Observe "Catalog Search index has been rebuilt successfully"

xx@xx:/var/www/magento2$ MAGE*INDEXER_THREADS_COUNT=4 php bin/magento indexer:reindex catalogsearch*fulltext
Catalog Search indexer process unknown error:
Indexer handler is not available: elasticsearch7
Catalog Search indexer process unknown error:
Indexer handler is not available: elasticsearch7
Catalog Search indexer process unknown error:
Indexer handler is not available: elasticsearch7
Catalog search index has been rebuilt successfully in ...

(Sidenote) The duplicated error messages are already fixed in scope of #30626

Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• <x] Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• [ > Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

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[m2-assistant]

Hi @engcom-Delta. Thank you for working on this issue.
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[magento-engcom-team]

✅ Confirmed by @engcom-Delta
Thank you for verifying the issue. Based on the provided information internal tickets MC-39718 were created

Issue Available: @engcom-Delta, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[m2-assistant]

Hi @engcom-Golf. Thank you for working on this issue.
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