Short answer: NO
For starters Orchestrator logs are more than enough. All execution logs triggered from connected studios / attended / unattended robots will be visible in Orchestrator.
You can later ingest these logs to any visualization software. So when you are installing orchestrator you do not need to worry about configuring Elastic Search.
When you install Orchestrator you will find a web.config file in IIS which you can later configure. Lets say you want a custom log or want to link your elastic search or send logs to a new SQL database. These can be updated in the web.config file and when you restart the IIS website these will take effect.
If you are further interested to fully use custom logging functions using NLog and use visualization tools for dashboards, I have a write up on it in this thread : Logs - ElasticSearch - Help / Insights - UiPath Community Forum
Hope this clarifies your doubts.