Man pages matching name search::elasticsearch::serializer::json in section 3pm:

Search::Elasticsearch::Serializer::JSON.3pm.en	debian 10 / libsearch-elasticsearch-perl
Search::Elasticsearch::Serializer::JSON.3pm.en	debian 11 / libsearch-elasticsearch-perl
Search::Elasticsearch::Serializer::JSON.3pm.en	debian 12 / libsearch-elasticsearch-perl