Elasticsearch version: 2.1.2

JVM version: openjdk 8u91-b14-0ubuntu4~15.10.1

OS version: ubuntu 15.10

Description of the problem including expected versus actual behavior:

Trying to put settings through REST API using YAML format fails with exception json_parse_exception.

Steps to reproduce:

1. simply run the following

curl -XPUT localhost:9200/some-index/_settings?pretty --data-binary '

---
analysis:
  analyzer:
    default: { type: keyword }
'

I believe that problem is here https://github.com/elastic/elasticsearch/blob/master/core/src/main/java/org/elasticsearch/common/settings/loader/SettingsLoaderFactory.java#L73-L79

PS: it made my day when I saw this lines, you guys are the best)