Скачать или смотреть Mastering the filter not in Elasticsearch DSL Query

Learn how to effectively use the `must_not` clause in your Elasticsearch DSL queries to filter out unwanted results, ensuring your searches are precise and relevant.
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This video is based on the question https://stackoverflow.com/q/68618717/ asked by the user 'sim' ( https://stackoverflow.com/u/15299206/ ) and on the answer https://stackoverflow.com/a/68619592/ provided by the user 'Sagar Patel' ( https://stackoverflow.com/u/5489276/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Filter Not in Elasticsearch DSL Query

Elasticsearch is an immensely powerful search engine that allows for the execution of complex queries through its Domain Specific Language (DSL). One common query challenge is filtering out specific results that do not meet certain criteria. In this guide, we’ll explore how you can achieve the filter not operation in an Elasticsearch DSL query.

Understanding the Problem

You might already have a query that successfully filters results using a specific term. For instance, take the following query which filters out documents with the name "Germany":

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

Your Ask

The question arises: How do you perform the reverse? More specifically, how can you implement a filter not operation to exclude results containing "Germany"?

The Solution

To filter out documents, you can utilize the must_not clause in a bool query. Let’s look at two options to achieve this:

Option 1: Using the filter with must_not

In this approach, you can still use the filter context, which is beneficial because it can optimize how Elasticsearch handles the query. Here’s how you can construct it:

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

In this example, the filter section ensures that non-Germany results are prioritized.

Option 2: Using must_not without filter

If you prefer not to use the filter context, you can directly add the must_not clause within the main bool query. Here's how that looks:

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

Note: Be aware that using this method will take "Germany" into account for score calculation, which might not be desirable in all use cases.

Conclusion

Filtering out specific terms in Elasticsearch can be effectively managed using the must_not clause in a bool query. By following the examples provided above, you can customize your search results to exclude unwanted data seamlessly.

Whether you opt for using the filter context or rely solely on the must_not clause is entirely dependent on your specific requirements and performance considerations.

Now that you have the tools to conduct precise searches, you can make your Elasticsearch implementations even more effective!