The other change is that we upgraded ElasticSearch from version 2 to version 6. This means that old ElasticSearch query syntax won't work anymore. You can refer to our docs for common queries and you can read the ElasticSearch documentation for further information: https://www.elastic.co/guide/en/elasticsearch/reference/6.2/search.html
Queries to the old API endpoint (search.sefaria.org) will return a deprecation message
Feel free to post here with any specific questions.