append values to an array in elasticsearch

PUT updateindextest/type1/1
{
    "counter" : 1,
    "roka" : ["red"]
}

PUT updateindextest/type1/2
{
    "counter" : 2,
    "roka" : ["sdf"]
}

POST /updateindextest/type1/_update_by_query?pretty

{

  "script": {

"inline": "ctx._source.roka.add(params.hits)",

"params": {"hits": "pila"}

  },

  "query": {

"match_all": {}

}

}

GET updateindextest/_search?pretty

{

  "query": {

    "match_all": {}

  }

}