What tools to use when searching a database with big data?

Question

PostgreSQL

It is necessary to implement similar functionality as https://hh.ru/search/vacancy?text=&area=1

All data is stored in the postgres database. As I see the solution to this problem:
1) Connect the NoSQL database.
2) Every 4 hours, run a cron task that will synchronize postgres with nosql database, count the number of resumes in the city, by gender, by salary, etc. Or catch an event when certain tables in Postgres have changed and run synchronization with nosql.

Answer 1

Elasticsearch, for Django there is django-haystack as an example.