What does 2 Kings 2:9 mean?

After they crossed the river, Elijah said to Elisha, 'What do you want me to do for you before I'm taken away?' Elisha answered, 'I want a double share of your spirit.' 2 Kings 2:9 - Modern Text Bible

(Elisha asks for a double portion, meaning he wants to inherit Elijah's prophetic role in full, not just a little bit. It's a bold request for spiritual authority and power.)