How do I do string search in Elasticsearch?

Question

I need to do string search in Elasticsearch like:

This is the content stored in elasticsearch

and I want it to match with "content stored in" for example, but not with "in stored content". Currently with the simple search both match.

Also I want to match with partial strings like "ontent stor" (not full words).

I know there are things like wildcard search, but they will scan all documents. I'd like to use features to have it run faster.

Prabin Meitei · Accepted Answer · 2015-04-23 17:41:20Z

2

Wildcard search are heavy. You can use ngram token filter in your analyzer and do term search. It will take care of matching partial string. Make sure that you use a different analyzer for search(without ngram token filter) if you are not using term search.

edited Apr 23, 2015 at 17:41

answered Apr 23, 2015 at 14:43

Prabin Meitei

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2 Comments

gotch4 Over a year ago

will term search actually match a string without tokenizing it?

Prabin Meitei Over a year ago

If you use the ngram token filter for your index it will generate ngram tokens. For eg: "a simple text" will result in tokens a, "a ", a s, a si', .... si, sim, simp, simpl, ..... and so on. You can refer the doc for more detail. Now when you do a term search it will return the doc if it matches any of the term. In term query your input string does not get analyzed.

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