Repro UnavailableShardsException when number of replicas greater than number of nodes

gistfile1.sh

# clean up test index
curl -XDELETE "http://localhost:9200/toomanyreplicas"

# create index
curl -XPOST "http://localhost:9200/toomanyreplicas" -d '
{
    "index" : {
        "analysis" : {
            "analyzer" : {
                "language_analyzer" : {
                    "type" : "snowball",
                    "language" : "English"
                }
            }
        },
        "number_of_shards": 5,
	"number_of_replicas": 2
    }
}
'

#create mapping
curl -XPOST "http://localhost:9200/toomanyreplicas/Document/_mapping" -d '
{
    "Document": {
        "_source": {
            "compress": false,
            "excludes": [
                "fileAttachment"
            ]
        },
        "properties": {
            "fileAttachment": {
                "type": "attachment",
                "path": "full",
                "fields": {
                    "fileAttachment": {
                        "type": "string",
                        "term_vector": "with_positions_offsets",
                        "index_analyzer": "language_analyzer",
                        "search_analyzer": "language_analyzer"
                    },
                    "author": {
                        "type": "string",
                        "store": true
                    },
                    "title": {
                        "type": "string",
                        "store": true,
                        "index_analyzer": "language_analyzer"
                    },
                    "name": {
                        "type": "string"
                    },
                    "date": {
                        "type": "date",
                        "format": "dateOptionalTime"
                    },
                    "keywords": {
                        "type": "string"
                    },
                    "content_type": {
                        "type": "string",
                        "store": true
                    },
                    "content_length": {
                        "type": "integer"
                    }
                }
            },
            "id": {
                "type": "string"
            },
            "currentVersionId": {
                "type": "string"
            }
        }
    }
}
'

# Attempt to index the document
curl -XPOST "http://localhost:9200/toomanyreplicas/testdocument" -d '
{
    "fileAttachment" : "ZmlnaHRpbmc="
}
'