where to start learning data analytics, aws development or solr/elastic search

I think it is time for me to update my skills for job searching. I come from java technology background and have experience in many frameworks - frontend and backend in the past. I do not have much interest in front end and want to learn search in services side and thinking of learning amazon/ cloud services. Also along with that, I have interests in big data/ data analytics and searching/query engine technologies - solr/lucene. Unfortunately, I do not know where to start and what will help me in long term. I do not have much interests in infrastructure side, mostly development side.