Added support for aliases to create index api

It is now possible to specify aliases during index creation:

curl -XPUT 'http://localhost:9200/test' -d '
{
    "aliases" : {
        "alias1" : {},
        "alias2" : {
            "filter" : { "term" : {"field":"value"}}
        }
    }
}'

Closes #4920
[DOCS] Remove clear flag from node-stats as it is not used anymore
Source filtering with wildcards broken when given multiple patterns

```
curl -XPUT 'http://localhost:9200/twitter/tweet/1' -d '{
    "user" : "kimchy",
    "post_date" : "2009-11-15T14:12:12",
    "message" : "trying out Elasticsearch", "retweeted": false
}'
```

No source fields delivered:

```
curl -XGET 'http://localhost:9200/twitter/tweet/1?_source=*.id,retweeted&pretty=yes'
```

`retweeted` returned:

```
curl -XGET 'http://localhost:9200/twitter/tweet/1?_source=retweeted,*.id&pretty=yes'
```

Closes #5132.
Closes #5133.