ES does not balance well if the machines are different sizes. This makes using a variety of spot instancetypes inefficient. If we can put multiple ES nodes on a single machine we can take advantage of the larger instances (should their prices ever fall), and have more nodes; more nodes means each can be smaller; smaller nodes can fit on smaller instances; smaller instances have greater spot savings.
use `es.config` parameter to point to config files > $ elasticsearch -Des.config=/path/to/config/file
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