Elasticsearch query on a specific index

I have already searching this since 2 days now. I use the sense chrome plugin to be able to test my queries but I don't find how to specify on which index he is supposed to search. So my queries search on all the indexes and it isn't easy to use.

I have try the following syntaxes:

GET _search
{
    "query": {
        "term": {
           "_index": {
              "value": "dev_events2"
           }
        }
    }

}

GET _search
{
    "_index": "dev_events2",
    "query": {
        "match_all" : {  }
    }

}

GET _search
{
    "index": "dev_events2",
    "query": {
        "match_all" : {  }
    }

}

Regards,

Benjamin V.

Edit I finally have found the answer: just add the index name into the url for the get: localhost:9201/myIndexName