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POelasticsearch group-by multiple fields
 

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    <p>i am Looking for the best way to group data in elasticsearch. Elasticsearch doesnt support something like 'group by' in sql.</p> <p>Lets say i have 1k categories and millions of products. what do you think is the best way to render a complete category tree? of couse jou need some metadata (icon, link-target, seo-titles,...) and custom sorting for the categories. </p> <ol> <li><p>Using Aggregations: Example: <a href="https://found.no/play/gist/8124563" rel="noreferrer">https://found.no/play/gist/8124563</a> looks useable if you have to group by one field, and need some extra fields.</p></li> <li><p>Using multiple Fields in a Facet (wont work) Example: <a href="https://found.no/play/gist/1aa44e2114975384a7c2" rel="noreferrer">https://found.no/play/gist/1aa44e2114975384a7c2</a> Here we lose the relation between the different fields.</p></li> <li><p>Building funny Facets <a href="https://found.no/play/gist/8124810" rel="noreferrer">https://found.no/play/gist/8124810</a></p></li> </ol> <p>for example building a category tree using this 3 "solutions" sucks. Solution 1 may work (ES 1 isnt stable right now) Solution 2 doesnt work Solution 3 is pain, because it feels ugly, you need to prepare a lot of data and the facets blow up.</p> <p>May an alternative could be not to store any category data in ES, just the id <a href="https://found.no/play/gist/a53e46c91e2bf077f2e1" rel="noreferrer">https://found.no/play/gist/a53e46c91e2bf077f2e1</a></p> <p>than you could get the assocated category from another system, like redis, memcache or the database.</p> <p>this would end up in clean code, but the performance could become a problem. for example loading 1k Categories from memcache / Redis / a database could be slow. another problem is that syncing 2 databases is harder than syncing one.</p> <p>how do you deal with such problems?</p> <p>i am sorry for the links, but i cant post more than 2 ones in one article.</p>
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