title: Elastic Search always returning score as zero
body: <p>I ran the index and I am trying to execute few queries to validate the data. I found that whatever request I sent the elastic search score is zero for all the results. I am trying different combinations in Kibana and all are documents returned contains _score as zero.
  Below is my request and response:</p>
  
  <pre><code>GET _search
  {
  "version": true,
  "size": 500,
  "sort": [
  {
    "_score": {
      "order": "desc"
    }
  }
  ],
  "_source": {
  "excludes": []
  },
  "stored_fields": [
  "*"
  ],
  "script_fields": {},
  "docvalue_fields": [],
  "query": {
  "bool": {
    "must": [],
    "filter": [
      {
        "match_all": {}
      },
      {
        "match_phrase": {
          "name": {
            "query": "RED"
          }
        }
      }
    ],
    "should": [],
    "must_not": []
  }
  },
   "highlight": {
   "pre_tags": [
    "@kibana-highlighted-field@"
  ],
  "post_tags": [
    "@/kibana-highlighted-field@"
  ],
  "fields": {
    "*": {}
  },
  "fragment_size": 2147483647
  }
  }
  </code></pre>
  
  <p>Response is :</p>
  
  <pre><code>{
    "took" : 126,
    "timed_out" : false,
    "_shards" : {
    "total" : 11,
    "successful" : 11,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
  "total" : {
    "value" : 4,
    "relation" : "eq"
  },
  "max_score" : 0.0,
  "hits" : [
    {
      "_index" : "products",
      "_type" : "product",
      "_id" : "11",
      "_version" : 3,
      "_score" : 0.0,
      "_source" : {
        "sellercode" : "1",
        "avgreviews" : 5.0,
        "saleprice" : null,
        "sellable" : null,
        "freedelivery" : false,
        "promotedprice" : null,
        "listprice" : 1200.2,
        "noofreviews" : 1,
        "outdooruse" : false,
        "warrantycode" : null,
        "australiasellable" : true,
        "newrelease" : null,
        "sku" : "VSTALDBED386_1",
        "height" : 68.0,
        "shortdescription" : "Loft Sofa Bed Wood Red Medium",
        "commercialuse" : true,
        "customisable" : true,
        "weight" : "5656.0KG",
        "typeCode" : "Bed - King Single",
        "colour" : "Red",
        "depth" : 51.0,
        "name" : "LOFT SOFA BED WOOD RED MEDIUM",
        "online" : true,
        "materialcode" : "Fabric",
        "assemblyrequired" : null,
        "category" : [ ],
        "stylecode" : "Contemporary"
      },
      "highlight" : {
        "name" : [
          "LOFT SOFA BED WOOD @kibana-highlighted-field@RED@/kibana-highlighted-field@ MEDIUM"
        ]
      }
    },
    {
      "_index" : "products",
      "_type" : "product",
      "_id" : "53",
      "_version" : 3,
      "_score" : 0.0,
      "_source" : {
        "sellercode" : "1",
        "avgreviews" : 5.0,
        "saleprice" : null,
        "sellable" : null,
        "freedelivery" : true,
        "promotedprice" : null,
        "listprice" : 9635.0,
        "noofreviews" : 1,
        "outdooruse" : false,
        "warrantycode" : null,
        "australiasellable" : true,
        "newrelease" : null,
        "sku" : "VSTALDBED393_1",
        "height" : 66.0,
        "shortdescription" : "tolix Stool Wood Red",
        "commercialuse" : false,
        "customisable" : false,
        "weight" : "6525.0KG",
        "typeCode" : "Bar Stool",
        "colour" : "Silver",
        "depth" : 25.0,
        "name" : "LILLI / TOLIX STOOL WOOD RED",
        "online" : true,
        "materialcode" : "Metal",
        "assemblyrequired" : null,
        "category" : [ ],
        "stylecode" : "Retro"
      },
      "highlight" : {
        "name" : [
          "LILLI / TOLIX STOOL WOOD @kibana-highlighted-field@RED@/kibana-highlighted-field@"
        ]
      }
    },
    {
      "_index" : "products",
      "_type" : "product",
      "_id" : "125",
      "_version" : 3,
      "_score" : 0.0,
      "_source" : {
        "sellercode" : "1",
        "avgreviews" : 3.0,
        "saleprice" : null,
        "sellable" : null,
        "freedelivery" : true,
        "promotedprice" : null,
        "listprice" : 6500.0,
        "noofreviews" : 1,
        "outdooruse" : false,
        "warrantycode" : null,
        "australiasellable" : true,
        "newrelease" : null,
        "sku" : "VSTALDBED405_1",
        "height" : 55.0,
        "shortdescription" : "Ialian Design New GasLift Chanelle Queen Size Red PU Leather Wodden 
       Bed frame",
        "commercialuse" : false,
        "customisable" : false,
        "weight" : "5693.0KG",
        "typeCode" : "Bed - Queen",
        "colour" : "red",
        "depth" : 58.0,
        "name" : "ITALIAN DESIGN NEW GASLIFT CHANELLE QUEEN SIZE RED PU LEATHER WOODEN BED FRAME",
        "online" : true,
        "materialcode" : "Timber",
        "assemblyrequired" : null,
        "category" : [ ],
        "stylecode" : "Contemporary"
      },
      "highlight" : {
        "name" : [
           "ITALIAN DESIGN NEW GASLIFT CHANELLE QUEEN SIZE @kibana-highlighted-field@RED@/kibana-highlighted-field@ PU LEATHER WOODEN BED FRAME"
        ]
      }
    },
    {
      "_index" : "products",
      "_type" : "product",
      "_id" : "707",
      "_version" : 3,
      "_score" : 0.0,
      "_source" : {
        "sellercode" : "2",
        "avgreviews" : 2.0,
        "saleprice" : null,
        "sellable" : null,
        "freedelivery" : false,
        "promotedprice" : null,
        "listprice" : 6326.0,
        "noofreviews" : 1,
        "outdooruse" : false,
        "warrantycode" : null,
        "australiasellable" : true,
        "newrelease" : null,
        "sku" : "VSTALDBED478_2",
        "height" : 36.0,
        "shortdescription" : "Leaf and Vine Rug Brown Cream red",
        "commercialuse" : false,
        "customisable" : true,
        "weight" : "6548.0KG",
        "typeCode" : "Shag Rug",
        "colour" : "Brown",
        "depth" : 47.0,
        "name" : "LEAF AND VINE RUG BROWN CREAM RED",
        "online" : true,
        "materialcode" : "Plastic",
        "assemblyrequired" : null,
        "category" : [ ],
        "stylecode" : "Contemporary"
      },
      "highlight" : {
        "name" : [
          "LEAF AND VINE RUG BROWN CREAM @kibana-highlighted-field@RED@/kibana-highlighted-field@"
        ]
      }
    }
  ]
   }
  </code></pre>
  
  <p>}
  Can you point me to right  direction tofix this score value.
  Thanks.</p>