Getting "API failure" from Elasticsearch 2.3.1

[dirkhschulz]

[root@somehost nagios-plugin-elasticsearch-1.1.0]# ./check_elasticsearch -p 9200
API failure

[widhalmt]

Hi,

I have the same error with Elasticsearch 5.0

Cheers,
Thomas

[darnux]

Had the same problem after upgrading ES from 1.x to 5.x.
An strace showed that prefix is "/" everytime (I do not use a prefix) and this leads to 404 for //_cluster/health in versions newer than 1.x:
strace sample:
sendto(3, "GET //_cluster/health HTTP/1.1\r\n"..., 134, 0, NULL, 0) = 134 recvfrom(3, "HTTP/1.1 404 Not Found\r\nes.index"..., 8192, 0, NULL, NULL) = 508

This fixed it for me (left original version, right my version):

96,97c96,97
< if not prefix.endswith('/'):
< prefix += '/'
---
> #if not prefix.endswith('/'):
> # prefix += '/'

Second problem arised with stats?all=true whereas the parametr all is not valid anymore.
This fixed it for me (left original version, right my version):`

143c143
< 'stats?all=true' % (host, port, prefix))
---
> 'stats' % (host, port, prefix))

Hope this can help you too.

[kwisatz]

I'm astonished that the API failure would also happen on 2.3.1, we've been using it on 2.4.2 without a hitch.