If you are typing your code in the Dev Tools of Kibana you can click on "terms," say, and then type cntr + / to bring up documentation automatically. You can also find a documentation link under the wrench icon near the code.
In general, I like to get to documentation by going to elastic.co, scrolling all the way to the bottom to find the link "Documentation." Another good trick would be to go to your-favorite-public-search and type "site:elastic.co" to isolate your results to Elastic pages. So in DuckDuckGo I'd type "aggs terms site:elastic.co" for example. The terms aggregation page with list and explain all the allowed parameters.
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