documents.yaml

title: Female
---

title: Female specimen

---

title: Microscopic examination of specimen from female

play.sh

#!/bin/bash

export ELASTICSEARCH_ENDPOINT="http://localhost:9200"

# Create indexes

curl -XPUT "$ELASTICSEARCH_ENDPOINT/play" -d '{
    "settings": {}
}'


# Index documents
curl -XPOST "$ELASTICSEARCH_ENDPOINT/_bulk?refresh=true" -d '
{"index":{"_index":"play","_type":"type"}}
{"title":"Female"}
{"index":{"_index":"play","_type":"type"}}
{"title":"Female specimen"}
{"index":{"_index":"play","_type":"type"}}
{"title":"Microscopic examination of specimen from female"}
'

# Do searches

curl -XPOST "$ELASTICSEARCH_ENDPOINT/_search?pretty" -d '
{
    "query": {
        "prefix": {
            "title": {
                "prefix": "femal"
            }
        }
    }
}
'

curl -XPOST "$ELASTICSEARCH_ENDPOINT/_search?pretty" -d '
{
    "query": {
        "span_first": {
            "end": 1,
            "match": {
                "span_multi": {
                    "match": {
                        "prefix": {
                            "title": {
                                "prefix": "femal"
                            }
                        }
                    }
                }
            }
        }
    }
}
'

curl -XPOST "$ELASTICSEARCH_ENDPOINT/_search?pretty" -d '
{
    "query": {
        "bool": {
            "should": [
                {
                    "span_first": {
                        "end": 1,
                        "match": {
                            "span_multi": {
                                "match": {
                                    "prefix": {
                                        "title": {
                                            "prefix": "femal"
                                        }
                                    }
                                }
                            }
                        }
                    }
                },
                {
                    "match": {
                        "title": {
                            "query": "female"
                        }
                    }
                }
            ]
        }
    }
}
'

play.yaml

# Auto generated by Found's Play-tool at 2013-12-24T02:00:22+01:00
version: 0
title: span_first to boost early matches
description: ""

searches.yaml

# In reply to http://stackoverflow.com/questions/20748647/boosting-field-prefix-match-in-elasticsearch

# This will match all documents.
query: 
    prefix: 
        title: 
            prefix: femal

---

# This matches only the two first documents.
query: 
    span_first:
        end: 1 
        match:
            span_multi:
                match:
                    prefix:
                        title:
                            prefix: femal
            

---

# This matches all, but prefers the one's with a prefix match.
query: 

    bool: 
        should: 
            # It's sufficient that either of these match, but prefer that both matches.
            - span_first:
                end: 1 
                match:
                    span_multi:
                        match:
                            prefix:
                                title:
                                    prefix: femal 
            - match: 
                title: 
                    query: female