Nested search filters

1. What is a nested filter?
2. How do I filter nested objects in Elasticsearch?
3. How do I search in nested fields?

What is a nested filter?

Nested filters are used when the query requires a more complex set of conditions. Nested filters mean there is a priority set to a group of conditions while the other group or groups are set with a different priority. The most basic rule is that the AND operation is prioritized before the OR operation.

How do I filter nested objects in Elasticsearch?

If so, you can filter nested objects by nested query and inner_hits option. If you mean filtering field of nested objects, you can use _source option for inner_hits.

How do I search in nested fields?

You can search nested fields using dot notation that includes the complete path, such as obj1.name . Multi-level nesting is automatically supported, and detected, resulting in an inner nested query to automatically match the relevant nesting level, rather than root, if it exists within another nested query.