Why cpu and memory too high?

my clusters both cpu and memory is too heavy,querys slow and even timeout happen sometimes,
ES cluster 2 nodes
ES Version: 5.1.0
Total size of open indices: 28GB
RAM:16GB Master
CPU: 4 core intel
total docs (logs mainly)is about 30,000,000+ total, 50,000+ per 15minutes
how can do to solve this, should I add a new node ?
as my machine setup ,what is the max number of total logs, so to know when to add a new node ?

thanks for any suggestions

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