The video contains a demonstration of the creation of a runtime field in which the day of the week is calculated from a timestamp field that contains the date. A visualization is then created in Kibana Lens using an indexed field and the newly created runtime field. Runtime field is the name given to the implementation of schema on read in Elasticsearch.

For this video, you can use the following example runtime field API calls: https://github.com/giladgal/Examples-for-Elasticsearch-runtime-fields-API-calls/blob/main/Creating%20a%20day%20of%20week%20runtime%20field%20and%20using%20it%20in%20Kibana