ElasticSearch–More like this

One of the nice features in ElasticSearch is ‘The More Like This’ Query. ‘The More Like This’ Query finds documents that are "like" a given set of documents. In order to do so, MLT selects a set of representative terms of these input documents, forms a query using these terms, executes the query and returns the results.

An example:

	var client = NuSearchConfiguration.GetClient();
	var result = client.Search<Document>(s => s
	.Query(q=>
	q.MoreLikeThis(sn => sn
	.Name("named_query")
	.Like(l => l
	.Document(d => d.Id("Test"))
	.Text("some long text")
	));

view raw MoreLikeThisQuery.cs hosted with ❤ by GitHub

The really important parameter is the Like() where you can specify free form text and/or a single or multiple documents.

More information: https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-mlt-query.html