5.6.4 on CentOS 7
[root@localhost ~]# lsof |grep elasticsearch|wc -l
6780
is that a normal number?
This ES instance is behind logstash, fwiw. The same command against logstash shows 170-200 open files.
Hmmm. I have a simple three node setup(ES 5.3.0) running on my home server(Darwin OS X) and it has
$> lsof | grep elasticsearch | wc -l
4670
Whether it should have this many or not, I don't know 
Using lsof is not an accurate way to count file descriptors (memory-mapped portions of a file, duplicate file descriptors because of counting per thread, etc.). Instead, please check: ls -al /proc/<PID>/fd.
How do I dynamically derive the pid so I can run the command in one step?
OK, now here is the story:
ls -al /proc/1109/fd -- logstash
203
ls -al /proc/1802/fd -- elasticsearch
548
better, yes?
The answer is is this command:
ls -al /proc/`pgrep -f logstash`/fd |wc -l
To see it unmangled, here is where I found it:
I edited your post.
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