example.md

Note that Title in the result ends with a ), but in the highlight result it is missing. What going on?

Mapping

{
  "content-search-sites-20-01-2017-16-12-22": {
    "mappings": {
      "searchindexdocument": {
        "properties": {
          "Authors": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              }
            }
          },
          "Categories": {
            "type": "keyword"
          },
          "Content": {
            "type": "text"
          },
          "Excerpt": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              }
            }
          },
          "Id": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              }
            }
          },
          "Private": {
            "type": "boolean"
          },
          "PublishedDate": {
            "type": "date"
          },
          "Site": {
            "type": "keyword"
          },
          "Tags": {
            "type": "keyword"
          },
          "Title": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              }
            }
          },
          "Url": {
            "type": "keyword"
          }
        }
      }
    }
  }
}

Search

GET content-search-sites/_search
{
  "size": 1, 
  "_source": "Title", 
    "query" : {
        "multi_match": { 
          "query": "Test", 
          "fields": [ "Title^4", "Tags^2", "Content", "Authors"]
        }
    },
    "highlight" : {
        "pre_tags": ["<mark>"],
        "post_tags": ["</mark>"], 
        "fields" : {
            "Content" : {
                "fragment_size" : 150,
                "number_of_fragments" : 3,
                "no_match_size": 150
            },
            "Title": {
              "fragment_size" : 150,
                "number_of_fragments" : 3,
                "no_match_size": 150
            }
        }
    }
}

Result

{
  "took": 15,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 8,
    "max_score": 3.0916476,
    "hits": [
      {
        "_index": "content-search-sites-20-01-2017-16-12-22",
        "_type": "searchindexdocument",
        "_id": "https-rimdev-io-under-the-decision-tree-12-1482476400",
        "_score": 3.0916476,
        "_source": {
          "Title": "Under the Decision Tree (#12)"
        },
        "highlight": {
          "Content": [
            " will help businesses fight hacker fraternisation, predict insider threats Google researchers develop a <mark>test</mark> for machine learning bias Microsoft Launches",
            " 3Pillar Global bets big on machine learning Discrimination by algorithm: scientists devise <mark>test</mark> to detect AI bias The Conundrum of Machine Learning and"
          ],
          "Title": [
            "Under the Decision Tree (#12"
          ]
        }
      }
    ]
  }
}

This was all done via Kibana, so NEST was not in the middle.