Return the most recent record from ElasticSearch index

Question

I would like to return the most recent record (top 1) from ElasticSearch index similar to the sql query below;

SELECT         


        

Answer 1

If you are using python elasticsearch5 module or curl:

1. make sure each document that gets inserted has
   • a timestamp field that is type datetime
   • and you are monotonically increasing the timestamp value for each document

2. from python you do

   es = elasticsearch5.Elasticsearch('my_host:my_port')
   es.search(
       index='my_index', 
       size=1,
       sort='my_timestamp:desc'
       )
   

If your documents are not inserted with any field that is of type datetime, then I don't believe you can get the N "most recent".