Investigate and propose fix for github issue 2219

[ruflin]

Fixes Call to a member function hasConnection() on null in Bulk.php by replacing removed Connection API calls with a configuration-based approach.

The error was introduced in Elastica 7.3.2 when new code in src/Bulk.php (for retryOnConflict logic) attempted to use Client::hasConnection() and Client::getConnection(). These methods were part of the Elastica\Connection class which was removed in Elastica 8.0, but the problematic code was backported to 7.3.2 without adapting to the new configuration-based approach, leading to a fatal error. This PR applies the correct configuration-based logic already present in the 9.x branch.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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