Doesn't work for DELETE requests

[sashazykov]

It can read indices, but for some reason it can not delete them:

2016-02-12 09:55:43,723 ERROR Got a 403 response from Elasticsearch. Error message: {"message":"The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.\n\nThe Canonical String for this request should have been\n'DELETE\n/logstash-2016.02.06%2Clogstash-2016.02.07%2Clogstash-2016.02.08%2Clogstash-2016.02.09%2Clogstash-2016.02.10%2Clogstash-2016.02.11\nmaster_timeout=30000\nhost:search-xontom-staging-xs2f3kyrtp43ivx4fr26ke3rgi.eu-west-1.es.amazonaws.com\nx-amz-date:20160212T095543Z\n\nhost;x-amz-date\ne3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855'\n\nThe String-to-Sign should have been\n'AWS4-HMAC-SHA256\n20160212T095543Z\n20160212/eu-west-1/es/aws4_request\ncd0341526ff24d686ea0bc93e0fd66d985e9e861f6aa96551ad7b2ab02758bd5'\n"}