Скачать или смотреть How to Filter Bucket Aggregation Results Based on Sub-Bucket Count in Elasticsearch

Discover how to effectively filter out userIDs with specific tags using aggregations in Elasticsearch. Learn step-by-step instructions with sample queries to achieve the desired results.
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How to Filter Bucket Aggregation Results Based on Sub-Bucket Count in Elasticsearch

If you're working with Elasticsearch and need to filter out certain user IDs based on the presence of specific tags, you're in the right place. This guide will walk you through a step-by-step approach to constructing a query that excludes user IDs with documents tagged as "TAG A" or "TAG B". Let's dive into the problem and solution.

The Problem

You have a dataset with documents that include user IDs and associated tags. Your goal is to retrieve a list of user IDs that do not have any documents tagged with certain 'excluded' tags, such as "TAG A" and "TAG B". In the context of the example, only the user ID "User4" should be returned as it doesn't have documents with the excluded tags. Here’s a brief overview of your data structure:

[[See Video to Reveal this Text or Code Snippet]]

Given this data, the expected output is:

[[See Video to Reveal this Text or Code Snippet]]

This is because "User4" has no documents with the tags "TAG A" or "TAG B".

The Solution

To achieve this filtering result, you can use a combination of aggregations in Elasticsearch. Below, I'll explain the steps involved and provide a sample query for implementation.

Steps to Build the Query

Aggregate on User IDs: First, you need to group your documents by user IDs. This will give you all the unique user IDs in your dataset.

Nested Aggregation with Filter: For each user ID, create a nested aggregation that filters documents based on the excluded tags. You only want to count documents for each user that match the excluded tags.

Bucket Selector Aggregation: Lastly, perform a bucket selector aggregation that filters out user IDs which have a document count greater than zero for the excluded tags. This will leave you with only those user IDs that have no documents with any excluded tag values.

Sample Query

Here’s an example Elasticsearch query that implements the above steps for excluded tags "TAG A", "TAG B", and "TAG C":

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following the outlined steps, you can effectively filter bucket aggregation results in Elasticsearch based on sub-bucket aggregation counts. This approach not only narrows down your results to relevant user IDs but also leverages the powerful aggregation capabilities of Elasticsearch to perform complex queries.

Feel free to adjust the query to fit your model and testing needs. Happy querying!