mongohq diff of small and ssd_1g_elastic plan

mongohq.md

performance check

find 10 ids

Benchmark.measure {100.times {CompletedSheet.find(ids)}}

no	small	ssd_1g_elastic
1	1.633871	0.803563
2	2.316147	1.083533
3	1.007594	0.639919
4	1.202081	0.968301
5	0.99812	0.861168
6	1.533603	0.917494
7	1.91035	0.793402
8	2.080687	0.783007
9	2.949292	1.050957
10	1.05136	0.891116
SUM	16.683105	8.79246
MAX	2.949292	1.083533
MIN	0.99812	0.639919
AVE	1.591961	0.883626

10回計測後に、最大・最小値を除いた8回の平均

180% faster