{
  _index: "bla_bla",
  .
  .
  .
  _source: {
    domain: "somedomain.extension",
    path: "/you/know/the/path",
    lang: "en",
    keywords: ["yeah", "you", "rock", "dude", "help", "me", "good", "samaritan"]
  }
}

{
    "query": {
        "filtered": {
            "filter": {
                "bool": {
                    "should": {
                        "terms": {
                            "keywords": ["stackoverflow", "rocks", "!"]
                        }
                    },
                    "must_not": {
                        "term": {
                            "path": "/"
                            // This works, i.e -> "lang": "en"
                        }
                    }
                }
            }
        }
    },
    "from": 0,
    "size": 9
}

{
    "query": {
        "filtered": {
            "filter": {
                "and": [
                    {
                        "bool": {
                            "should": {
                                "terms": {
                                    "keywords": [
                                        "stackoverflow",
                                        "rocks",
                                        "!"
                                    ]
                                }
                            }
                        }
                    },
                    {
                        "filter": {
                            "regexp": {
                                "path": ".{1,}"
                            }
                        }
                    }
                ]
            }
        }
    },
    "from": 0,
    "size": 9
}

PUT /index1/test/_mapping
{
    "test" : {
        "properties" : {
            "message" : {"type" : "string"},
            "path" : {"type" : "string", "index" : "not_analyzed"}
        }
    }
}

POST index1/test
{
  "path" : "/foo/bar"
}

GET index1/test/_search
{
  "query": {
    "filtered": {
      "filter": {
        "term": {
          "path": "/foo/bar"
        }
      }
    }
  }
}