Updating schema section added in Elasticsearch docs (#2342)

* Updating schema added in Elasticsearch docs

* Fix

* info added

* Line added

docs/search/search_engines/elastic_search/elastic_search_overview.md

@@ -19,4 +19,22 @@ Start with the [Set up Elasticsearch](https://www.elastic.co/guide/en/elasticsea
 
 **Prerequisite**
 
-To proceed you need to be familiar with how indexing, filtering and queries work.
+To proceed you need to be familiar with how indexing, filtering and queries work.
+
+## Update Elasticsearch schema
+
+Whenever you make any changes in case of variables (for example, environmental ones) or configuration files, you need to erase Elasticsearch index, update the schema, and rebuild the index.
+
+To delete the index, you can use an HTTP request.
+Use the command as in the following example:
+
+```bash
+curl --request DELETE 'https://elasticsearch:9200/_all'
+```
+
+To update the schema and then reindex the search, use the following commands:
+
+```bash
+php bin/console ibexa:elasticsearch:put-index-template --overwrite
+php bin/console ibexa:reindex
+```