ElasticSearch 1.7.3 crashed and doesn't restart - no logs

Elastic Stack Elasticsearch
17

I output stdout and stderr to a file that I kept just in case. It exited by itself within 10 seconds. Anyway, here are the 10 lines as requested:

rt_sigaction(SIGINT, {SIG_DFL, [], SA_RESTORER, 0x7f9b9938ad40}, {0x4438a0, [], SA_RESTORER, 0x7f9b9938ad40}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=25287, si_status=0, si_utime=0, si_stime=0} ---
wait4(-1, 0x7ffe20c75ed8, WNOHANG, NULL) = -1 ECHILD (No child processes)
rt_sigreturn()                          = 0
write(1, "   ...fail!\n", 12)           = 12
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
exit_group(1)                           = ?
+++ exited with 1 +++