title: Elasticsearch- how to do multi search request on Sense or Head plugin
body: <p>I am trying to achieve this multi search request on sense and plugin head but I am not able to get what could be the problem?
  sample on <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/search-multi-search.html#search-multi-search" rel="nofollow noreferrer">doc</a> is for curl, I cant comprehend what is the exact difference. </p>
  
  <pre><code>POST _msearch?pretty=1 
  {"myIndex":"Product"}
  {
    "fields": [
        "id",
      "Name"
    ], 
  "query": {
   "bool": {
        "should": [
          {
            "query_string": {
              "default_field": "_all",
              "query": "key"
            }
          }
        ] 
      }      
  
    }
  ,
    "from": 0,
    "size": 5,
    "sort": [],
    "aggs": {}
  }
  {"myIndex":"Printer"}{
    "fields": [
        "id",
      "Name"  
    ], 
  "query": {
   "bool": { 
        "must": [{
        "has_child": {
       "type": "Printer",
       "query": {
          "match": {
          "Name": "key"
          }
        }
      }
        }]
      }      
  
    }
  ,
    "from": 0,
    "size": 5,
    "sort": [],
    "aggs": {}
  }
  </code></pre>
  
  <p>I am getting this error on sense. 
  {
     "error": "JsonParseException[Unexpected end-of-input: expected close marker for OBJECT (from [Source: [B@48acbc4c; line: 1, column: 0])\n at [Source: [B@48acbc4c; line: 1, column: 3]]",
     "status": 500
  }</p>