Is it normal for ES to open many connections to itself? I'm on ES version 6.1.1. I have 3 machines in a cluster (internal IPs are: 172.16.2.4, 2.5 and 2.6). Is it normal for all of the 127.0.0.1 connections to itself?When doing netstat -aon, I see about 100 entries that look like this:
Proto Local Address Foreign Address State PID
TCP 127.0.0.1:9200 127.0.0.1:60324 ESTABLISHED 10160
TCP 127.0.0.1:59300 127.0.0.1:59301 ESTABLISHED 10160
TCP 127.0.0.1:59301 127.0.0.1:59300 ESTABLISHED 10160
TCP 127.0.0.1:59302 127.0.0.1:59303 ESTABLISHED 10160
TCP 127.0.0.1:59303 127.0.0.1:59302 ESTABLISHED 10160
TCP 127.0.0.1:59304 127.0.0.1:59305 ESTABLISHED 10160
TCP 127.0.0.1:59305 127.0.0.1:59304 ESTABLISHED 10160
TCP 127.0.0.1:59306 127.0.0.1:59307 ESTABLISHED 10160
TCP 127.0.0.1:59307 127.0.0.1:59306 ESTABLISHED 10160
TCP 127.0.0.1:59308 127.0.0.1:59309 ESTABLISHED 10160
TCP 127.0.0.1:59309 127.0.0.1:59308 ESTABLISHED 10160
TCP 127.0.0.1:59310 127.0.0.1:59311 ESTABLISHED 10160
TCP 127.0.0.1:59311 127.0.0.1:59310 ESTABLISHED 10160
TCP 127.0.0.1:59312 127.0.0.1:59313 ESTABLISHED 10160
TCP 127.0.0.1:59313 127.0.0.1:59312 ESTABLISHED 10160
TCP 127.0.0.1:59314 127.0.0.1:59315 ESTABLISHED 10160
TCP 127.0.0.1:59315 127.0.0.1:59314 ESTABLISHED 10160
TCP 127.0.0.1:59316 127.0.0.1:59317 ESTABLISHED 10160
TCP 127.0.0.1:59317 127.0.0.1:59316 ESTABLISHED 10160
TCP 127.0.0.1:59318 127.0.0.1:59319 ESTABLISHED 10160
TCP 127.0.0.1:59319 127.0.0.1:59318 ESTABLISHED 10160
TCP 127.0.0.1:59320 127.0.0.1:59321 ESTABLISHED 10160
TCP 127.0.0.1:59321 127.0.0.1:59320 ESTABLISHED 10160
TCP 127.0.0.1:59322 127.0.0.1:59323 ESTABLISHED 10160
TCP 127.0.0.1:59323 127.0.0.1:59322 ESTABLISHED 10160
TCP 127.0.0.1:59324 127.0.0.1:59325 ESTABLISHED 10160
TCP 127.0.0.1:59325 127.0.0.1:59324 ESTABLISHED 10160
TCP 127.0.0.1:59326 127.0.0.1:59327 ESTABLISHED 10160
TCP 127.0.0.1:59327 127.0.0.1:59326 ESTABLISHED 10160
TCP 127.0.0.1:59328 127.0.0.1:59329 ESTABLISHED 10160
TCP 127.0.0.1:59329 127.0.0.1:59328 ESTABLISHED 10160
TCP 127.0.0.1:59330 127.0.0.1:59331 ESTABLISHED 10160
TCP 127.0.0.1:59331 127.0.0.1:59330 ESTABLISHED 10160
TCP 127.0.0.1:59332 127.0.0.1:59333 ESTABLISHED 10160
TCP 127.0.0.1:59333 127.0.0.1:59332 ESTABLISHED 10160
TCP 127.0.0.1:59334 127.0.0.1:59335 ESTABLISHED 10160
TCP 127.0.0.1:59335 127.0.0.1:59334 ESTABLISHED 10160
TCP 127.0.0.1:59336 127.0.0.1:59337 ESTABLISHED 10160
TCP 127.0.0.1:59337 127.0.0.1:59336 ESTABLISHED 10160
TCP 127.0.0.1:59338 127.0.0.1:59339 ESTABLISHED 10160
TCP 127.0.0.1:59339 127.0.0.1:59338 ESTABLISHED 10160
TCP 127.0.0.1:59340 127.0.0.1:59341 ESTABLISHED 10160
TCP 127.0.0.1:59341 127.0.0.1:59340 ESTABLISHED 10160
TCP 127.0.0.1:59342 127.0.0.1:59343 ESTABLISHED 10160
TCP 127.0.0.1:59343 127.0.0.1:59342 ESTABLISHED 10160
TCP 127.0.0.1:59344 127.0.0.1:59345 ESTABLISHED 10160
TCP 127.0.0.1:59345 127.0.0.1:59344 ESTABLISHED 10160
TCP 127.0.0.1:59346 127.0.0.1:59347 ESTABLISHED 10160
TCP 127.0.0.1:59347 127.0.0.1:59346 ESTABLISHED 10160
TCP 127.0.0.1:59348 127.0.0.1:59349 ESTABLISHED 10160
TCP 127.0.0.1:59349 127.0.0.1:59348 ESTABLISHED 10160
TCP 127.0.0.1:59350 127.0.0.1:59351 ESTABLISHED 10160
TCP 127.0.0.1:59351 127.0.0.1:59350 ESTABLISHED 10160
TCP 127.0.0.1:59352 127.0.0.1:59353 ESTABLISHED 10160
TCP 127.0.0.1:59353 127.0.0.1:59352 ESTABLISHED 10160
TCP 127.0.0.1:59354 127.0.0.1:59355 ESTABLISHED 10160
TCP 127.0.0.1:59355 127.0.0.1:59354 ESTABLISHED 10160
TCP 127.0.0.1:59356 127.0.0.1:59357 ESTABLISHED 10160