GC logs on elasticsearch host

Hi,
Can anybody help me to read and understand below logs?

2016-07-28T09:34:55.973+0300: 68361.921: Total time for which application threads were stopped: 0.0003690 seconds, Stopping threads took: 0.0001850 seconds
2016-07-28T09:34:58.059+0300: 68364.007: [GC2016-07-28T09:34:58.059+0300: 68364.007: [ParNew
Desired survivor size 8716288 bytes, new threshold 6 (max 6)
- age   1:    5982224 bytes,    5982224 total
- age   2:     974168 bytes,    6956392 total
- age   3:     214296 bytes,    7170688 total
: 147860K->8990K(153344K), 0.0339550 secs] 706985K->568116K(6274432K), 0.0342020 secs] [Times: user=0.07 sys=0.00, real=0.04 secs]

br,
Sunil