this might come as incredibly cynic for some, but illustrates an important point - languages/frameworks/whole marketed stacks like ELK are merely tools for you to accomplish the task, which in the end is either to reduce costs or increase revenue

so naturally it doesn't matter (in long term) what you should learn to get a first job, change jobs, change domains - prioritize ROI the tool would give you in future, a job market, and your sanity :)