[8.15, 8.16] Root API - Incorrect HTTP method for uri [/]

[ossimoi]

Elasticsearch Version

8.16

Installed Plugins

No response

Java Version

openjdk 17.0.13 2024-10-15

OS Version

Linux host 6.1.82 #97 SMP PREEMPT_DYNAMIC Tue May 7 13:13:04 UTC 2024 x86_64 Linux

Problem Description

Trying to query http://localhost:9200 for node informations returns:

{"error":"Incorrect HTTP method for uri [/] and method [GET], allowed: [DELETE]","status":405}

Happens on 8.15 and 8.16. Last known working version for us is 8.8.

https://www.elastic.co/guide/en/elasticsearch/reference/current/rest-api-root.html

Steps to Reproduce

curl http://localhost:9200

[DaveCTurner]

For me on a freshly downloaded and unpacked 8.16.0 tarball I get the expected response:

$ curl -vv http://localhost:9200
* Host localhost:9200 was resolved.
* IPv6: ::1
* IPv4: 127.0.0.1
*   Trying [::1]:9200...
* connect to ::1 port 9200 from ::1 port 51192 failed: Connection refused
*   Trying 127.0.0.1:9200...
* Connected to localhost (127.0.0.1) port 9200
> GET / HTTP/1.1
> Host: localhost:9200
> User-Agent: curl/8.7.1
> Accept: */*
>
* Request completely sent off
< HTTP/1.1 200 OK
< X-elastic-product: Elasticsearch
< content-type: application/json
< content-length: 531
<
{
  "name" : "node-0",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "QU5Ph65kToGKTF8fNhdKdQ",
  "version" : {
    "number" : "8.16.0",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "12ff76a92922609df4aba61a368e7adf65589749",
    "build_date" : "2024-11-08T10:05:56.292914697Z",
    "build_snapshot" : false,
    "lucene_version" : "9.12.0",
    "minimum_wire_compatibility_version" : "7.17.0",
    "minimum_index_compatibility_version" : "7.0.0"
  },
  "tagline" : "You Know, for Search"
}
* Connection #0 to host localhost left intact

You're going to have to give a more precise description of how to reproduce this.

[ossimoi]

Thanks for testing. Is it possible for missing module to cause this?

To answer my own question; yes it is. rest-root. Closing, sorry for the noise!