How to change the order of search results on Elastic Search?

I was able to reproduce the issue with sample data and My solution is using a query time boost, as index time boost is deprecated from the Major version of ES 5.

Also, I've created sample data in such a manner, that without boost both the sample data will have a same score, hence there is no guarantee that one which has match comes first in the search result, this should help you understand it better.

1. Index Mapping

{    "mappings": {        "properties": {            "title": {                "type": "text"            },            "second_title" :{                "type" :"text"            }        }    }}

2. Index Sample docs

a)

{    "title": "opster",    "second_title" : "Dimitry"}

b)

{    "title": "Dimitry",    "second_title" : "opster"}

Search query

{    "query": {        "bool": {            "should": [                {                    "match_phrase_prefix": {                        "title": {                        "query" : "dimitry",                        "boost" : 2.0  <-- Notice the boost in `title` field                        }                    }                },                {                    "match_phrase_prefix": {                        "second_title": {                            "query" : "dimitry"                        }                    }                }            ]        }    }}

Output

"hits": [            {                "_index": "60454337",                "_type": "_doc",                "_id": "1",                "_score": 1.3862944,                "_source": {                    "title": "Dimitry", <-- Dimitry in title field has doube score                    "second_title": "opster"                }            },            {                "_index": "60454337",                "_type": "_doc",                "_id": "2",                "_score": 0.6931472,                "_source": {                    "title": "opster",                    "second_title": "Dimitry"                }            }        ]

Let me know if you have any doubt understanding it.