• Added Elasticsearch 9 and Elastica 9 support.
• headers client config is now applied via Transport::setHeader() so it works uniformly across Guzzle, Symfony HTTP Client, and elastic-transport's bundled Curl client.
• timeout client config is now translated to CURLOPT_TIMEOUT at runtime when the active transport client is elastic-transport's bundled Curl — Guzzle/Symfony HTTP Client keep consuming the original 'timeout' key as before.
• Default config no longer injects 'headers' => [] / 'timeout' => 30 into http_client_options, which would otherwise break elastic-transport's bundled Curl client (PHP 8+ ValueError on unknown curl_setopt_array keys).
• Deprecated the top-level headers and timeout client config. Move them into client_options — for Guzzle/Symfony HTTP Client use headers / timeout, for the bundled Curl client use CURLOPT_HTTPHEADER / CURLOPT_TIMEOUT.
• Fix deprecated Symfony method call.
• Instantiate custom repositories using the DI service locator.
• Add compatibility with doctrine/doctrine-bundle 3.x, doctrine/phpcr-odm 3.x and Symfony 8.0 in highest-deps CI.
• Raise minimum versions of doctrine/doctrine-bundle (^2.5), doctrine/orm (^2.17) and jms/serializer-bundle (^5.4) to fix lowest-deps CI.