Elasticsearch 6 works with Elasticsearch 5 client on frontend

[ihor-sviziev]

Preconditions (*)

1. Magento 2.3.2 & 2.3-develop
2. Elasticsearch 6.5
3. XDebug

Steps to reproduce (*)

1. Open PhpStorm, add breakpoints in:

• Elasticsearch 6.x client:

  magento2/app/code/Magento/Elasticsearch6/Model/Client/Elasticsearch.php

  Line 66 in 6d6f11b

  $pid = getmypid();

• Elasticsearch 5.x client:

  magento2/app/code/Magento/Elasticsearch/Elasticsearch5/Model/Client/Elasticsearch.php

  Line 71 in 6d6f11b

  $pid = getmypid();

2. Go to Admin >> Stores >> Configurations >> Catalog >> Catalog >> Search
3. Configure Elasticsearch settings to use "Elasticsearch 6.0+" option
4. Click "Test connection", see where your breakpoint was paused
5. Save all configs, do reindex
6. Go to any category page, see where your breakpoint was paused
7. Go to any search page, see where your breakpoint was paused

Expected result (*)

1. In all cases you should see that code paused at Elasticsearch 6.x client

Actual result (*)

1. During test connection code paused in Elasticsearch 6.x client ✔
2. On category page code paused in Elasticsearch 5.x client ❌
3. On search results page code paused in Elasticsearch 5.x client ❌

[m2-assistant]

Hi @ihor-sviziev. Thank you for your report.
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Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

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@ihor-sviziev do you confirm that you were able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

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[m2-assistant]

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[magento-engcom-team]

✅ Confirmed by @engcom-Charlie
Thank you for verifying the issue. Based on the provided information internal tickets MC-20619 were created

Issue Available: @engcom-Charlie, 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 @p-bystritsky. Thank you for working on this issue.
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