Thank you for your feedback. We are indeed actively working on providing more helpful documentation in the tooltips via UI for better usability. Stay tuned!
By the way, you asked:
What is the meaning of Load(1m) graph.
- system load average over X minute, in this case over 1 minute.
Load graph Color difference (white, yellow and red)?
- I'm not sure which chart you're referring to here, so maybe screen shot would help? But different colors in a given chart usually don't mean anything. For example, Kibana's Load chart will show three colors for showing three different metrics (Load Average over 1m, 5m, 15m), so that it's easier to distinguish one from another.
What is the search request rate mean?
- Search Rate - Total Shards: Number of search requests being executed across primary and replica shards. A single search can run against multiple shards!