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December 19, 2014 @ 11:56:41

On the SitePoint PHP blog a new tutorial has been posted showing you how to effectively search Chinese content with ElasticSearch. ElasticSearch is a "powerful open source search and analytics engine that makes data easy to explore" and plays nice with PHP via a JSON based query format.

If you have played with Elasticsearch, you already know that analyzing and tokenization are the most important steps while indexing content, and without them your pertinency is going to be bad, your users unhappy and your results poorly sorted. Even with English content you can lose pertinence with a bad stemming, miss some documents when not performing proper elision and so on. And that's worse if you are indexing another language; the default analyzers are not all-purpose. When dealing with Chinese documents, everything is even more complex, even by considering only Mandarin which is the official language in China and the most spoken worldwide.

He starts by explaining exactly what the problem is with searching Chinese content including the fact that some words can actually be a combination of two or more characters (words). He then lists out a few plugins and tools that can be integrated with ElasticSearch to help with analyzing the content. He goes through each of them and provides instructions on installation and usage. He ends the post with a sample of the results for a set of three search terms, comparing the matches each found.

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chinese search elasticsearch tutorial tokenization analysis

Link: http://www.sitepoint.com/efficient-chinese-search-elasticsearch/

VG Tech Blog:
Using Elastica to Query ElasticSearch
July 03, 2012 @ 08:55:10

On the VG Tech blog today there's a new post by Christer Edvartsen about using the Elastica PHP Elastic Search client to do more than just pull information out of the data source. He dug into the source of the tool itself and figured out a way to perform actual queries.

The last couple of months I have been playing around with elasticsearch, an open source, distributed, RESTful search engine built on top of Apache Lucene. To interact with elasticsearch in PHP I have been using a client called Elastica. This was all fun and games until I needed to do actual queries, which is what our users will be doing most of the time. Elastica's documentation does not (yet) say anything about how to search using the client, so I needed to dig through the code to see if I could find some solutions.

He includes a sample mapping structure and shows how to take both a simple, single-term query and turn it into a request and how to make a more complex request with filters, facets, sorting and a few other things thrown in. He also shows how you can manually create a query (define the JSON structure yourself) and push that into the "query builder" for handling.

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elastica elasticsearch query tutorial


Richard Miller's Blog:
Symfony2 Integrating elasticsearch
November 28, 2011 @ 11:40:06

Richard Miller has been posting a series of articles to his blog recently that look at integrating the ElasticSearch tool with a Symfony2-based application.

Elasticsearch is built on top of Lucene and indexes data as JSON documents in a similar way to the way MongoDB stores data. This means as with Mongo that it is schemaless and creates fields on the fly. It is queried over HTTP using queries which are themselves defined in JSON. [...] What I want to do is look at how you can avoid having to deal with issuing JSON queries over HTTP from a Symfony2 app and actually get started using elasticsearch in a very simple way.

He uses the Elastica PHP library to do some of the "heavy lifting" in the three posts so far:

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