Fix mongodb multiple hosts connection issue

[ritalwar]

• Bug

What does this PR do?

This PR resolves the issues when multiple hosts are used for connection.
This will allow mongodb replica sets in connection string URI to successfully parse and fetch data.

Different host inputs scenarios tested as part of this PR are as follows:

1. Multiple Hosts: mongodb://localhost:27017,localhost:27022,localhost:27023
2. With DirectConnection option: mongodb://localhost:27017/?directConnection=true
3. With Replica Set Option: mongodb://localhost:27017,localhost:27022,localhost:27023/?replicaSet=dbrs
4. Single Host without mongodb prefix: localhost:27017
5. With mongodb prefix: mongodb://localhost:27017
6. "mongodb://myuser:mypass@localhost:40001", "otherhost:40001"

Why is it important?

Without this there will be a bug while using multiple hosts in mongodb connection URI.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

How to test this PR locally

Enable mongodb module. In mongodb.yml file test with both single and multiple hosts connections and it should work for both and fetch data successfully.

Related issues

• Closes MongoDB metricsets incorrectly handling multiple hosts #32188

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @ritalwar? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

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• Start Time: 2023-05-23T15:10:38.947+0000

• Duration: 53 min 30 sec

Test stats 🧪

Test	Results
Failed	0
Passed	4376
Skipped	890
Total	5266

💚 Flaky test report

Tests succeeded.

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[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mongodb_multihost_32188 upstream/mongodb_multihost_32188
git merge upstream/main
git push upstream mongodb_multihost_32188

[lalit-satapathy]

We can improve the documentation to capture different URL scenarios (single, replica set) supported?

[ritalwar]

We can improve the documentation to capture different URL scenarios (single, replica set) supported?

Done.

[lalit-satapathy]

@ritalwar, Can we also add the different MongoDB hosts configuration, currently testing has been done in the PR description?

[ritalwar]

@ritalwar, Can we also add the different MongoDB hosts configuration, currently testing has been done in the PR description?

sure, will update.

[shmsr]

Left some comments. Also, give me some more time to test these changes.

[ritalwar]

As per discussions with @ritalwar, I have opened a PR: ritalwar#1 (read the PR's description for more details) that aims to refactor mongodb module so that it aligns with standards of other modules. Changes also fixes the issues which we found during testing. In case the changes look good, we can cherry-pick the commit(s).

After further discussions with @lalit-satapathy, I'm currently addressing the issues identified during testing in this PR. To ensure better tracking and organization, we can handle the refactoring of the MongoDB module in a separate PR.

[leehinman]

code changes look good. just want a healthcheck in the docker-compose.yml to improve CI reliability