Highlights not found during search with snowball analyzer in Elastic Search

Elastic Stack Elasticsearch
1

I have created index for documents by setting the "snowball" analyzer for "content" filed in mapping.

Please check the following mapping for "content" filed of document.

"content": {
              "type": "attachment",
              "path": "full",
              "fields": {
                 "content": {
                    "type": "string",
                    "store": true,
                    "term_vector": "with_positions_offsets",
                    "analyzer": "snowball"
                 },
                 "author": {
                    "type": "string"
                 },
                 "title": {
                    "type": "string",
                    "store": true
                 },
                 "name": {
                    "type": "string"
                 },
                 "date": {
                    "type": "date",
                    "format": "dateOptionalTime"
                 },
                 "keywords": {
                    "type": "string"
                 },
                 "content_type": {
                    "type": "string"
                 },
                 "content_length": {
                    "type": "integer"
                 },
                 "language": {
                    "type": "string"
                 }
              }
           }

While searching for document, we are also fetching the matching snippets using the following search query.

GET  _search
{
  "query" : {
    "bool" : {
      "must" : {
        "bool" : {
          "should" : [ {
            "match" : {
              "content" : {
                "query" : "\"book to bill ratio\"",
                "type" : "phrase"
              }
            }
          } ],
          "minimum_should_match" : "1"
        }
      }
    }
  },
  "highlight" : {
    "fields" : {
      "content" : { }       
    }
  }
}

We have noticed an issue in searching for phrases, whenever stop words (such as "to", "and", "is" etc) present in search phrase, above query is able to find the matching document. But, it failed to find the matching snippets inside the document.

We are using the Elastic search version: 1.7.3

Appreciate your help.

2

Please format your code.

Could you give a full script which reproduces your issue but with a simplified context (I mean without mapper attachments)?

3

We are indexing the documents using the snowball analyzer. We need to search documents based on keywords. We are also interested in getting the highlights or snippets from the matched documents. Search is giving the snippets for phrases with out stop words. In case of phrase consist of stop words, it only returns the matching document, but not returning any snippets in side document.

This is similar to the issue raised in github
https://github.com/elastic/elasticsearch/issues/2157

I appreciate your help.