Elastic Search with mongodb

[Dika Andharu]

how to build search engine like google ?

I have problem to find array of collection in mongodb.

I want to find in mongodb but just type in short text looks like when I type db.test.find({Name: "Di"}) and the result are Name: "Dika" or Name: "Dina".

But, when I type db.test.find({Name: "Di"}) and the result is nothing appeared. So, anyone who know to built search engine like that. Please tell me...

Thanks :)

[Alexander Behrens]

How to build a search engine like Google? Now that´s what I call an interesting question :)

I think what you are looking for is an autocomplete function that is searching on a set of documents? I would suggest using Elastic Search for searching and MongoDB for persistence. When updating MongoDB documents also update Elastic Search in the process. Elastic Search has very nice built-in tools for your purpose. Have a look at the Completion Suggester (http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-suggesters-completion.html) or the N-Gram Tokenizer (http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/analysis-ngram-tokenizer.html) if hard drive space is not an issue.

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[Tugdual Grall]

Hello

I will not directly respond to your question, since I believe that for this specific requirement you can (should?) do it with MongoDB only.

If your requirement is to be able to do autocompletion you just need to use an index in MongoDB: 

 - if you use a standard index  ensureIndex(  { name : 1 }  ); and use regular expression $regexp

   In this case you have to be careful about the case (lower/upper) and the behavior in with the index

   shell : 

       - db.test.find( { name: { $regex: /^D/ } }  )

       - db.test.find( { name: { $regex: /^d/i } }  )

  See in Java and Node:

        - https://github.com/tgrall/mongodb-workshop/blob/complete/java/src/main/java/org/mongodb/workshop/api/CharactersService.java#L89

        - https://github.com/tgrall/mongodb-workshop/blob/complete/node-js/src/services/charactersService.js#L47

  See documentation : http://docs.mongodb.org/manual/reference/operator/query/regex/ especially the index part:

  http://docs.mongodb.org/manual/reference/operator/query/regex/#index-use

Also you have talked about "building a search engine" and the integration with Elasticsearch is the way to go,  but you can also look at the MongoDB Full Text Search and see if this covers all your requirements:

- http://docs.mongodb.org/manual/core/index-text/

Regards

Tug

@tgrall

[Tyler Brock]

For the prefix case a regular expression query over a regular index works well but as of MongoDB 2.4 using a regular expression query for building a more generic search engine is not the best option. Please use text indexes/queries instead:

http://docs.mongodb.org/manual/core/index-text/

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[Stephen Steneker]

On Friday, 30 January 2015 03:59:23 UTC+11, Tyler Brock wrote:

For the prefix case a regular expression query over a regular index works well but as of MongoDB 2.4 using a regular expression query for building a more generic search engine is not the best option. Please use text indexes/queries instead:

http://docs.mongodb.org/manual/core/index-text/

Text search is useful if you want language-based stemming and word/phrase matching, but doesn't cater for fuzzy/partial matches.

For some more ideas, see: http://stackoverflow.com/questions/27977575/mongodb-approximate-string-matching/27984038#27984038

Regards,

Stephen