Match Prefix Query doesn't return proper results

Elastic Stack Elasticsearch
1

Hello.

I have a problem with my query which looks like that:

`{
	"from" : 0, 
	"size" : 500, 
	"query" : { 
		"bool" : { 
			"must" : { 
				"bool" : { 
					"should" : { 
							"match" : { 
									"title" : { 
										"query" : "whirlpool c", 
										"type" : "phrase_prefix" 
									}  
							} 
					}, 
				"minimum_should_match" : "1" 
			} 
		} 
	} 
	}, 
	"sort" : [ { 
		"modified" : { 
			"order" : "desc", 
			"missing" : "_last" 
		} 
	}, 
	{ 
		"_score" : { 
  			"order" : "asc", 
				"missing" : "_last" 
		} 
	}] 
}`

This query is returning 0 hits. If I will search for "whirlpool ch" it's working fine. i've got few similar cases.
I'm working on elasticsearch 1.7.

I don't know why it's not returning results for whirlpool c, for different words combination it's working fine.
For example if I will have document with property title set to "My new title" and I will search for "new t", it's working fine.

The document which I'm looking for is called "whirlpool changes the world".
I created different document with title "whirlpool created something new", but it also cannot be found. Of course If I will look for "whirlpool cr", then document is found.

Any ideas what can be wrong?

2

I found the reason why I didn't get results.

setting the max_expansions to a bigger value (which by default is set to 10, I think) fixed an issue.