All searching is done in Elasticsearch. Kibana is only a fancy GUI that sits on top of the Elasticsearch API. The search to Elasticsearch returns the first X matching documents and a total number of all matching documents (http://nocf-www.elastic.co/guide/en/elasticsearch/reference/current/search-request-body.html for more information). The 1,791,751 number is just the hits.total number returned from Elasticsearch. The displayed documents are just the contents returned in hits.hits from Elasticsearch.
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