Dynamic templates in Elasticsearch - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a dynamic template in Elasticsearch?

A dynamic template lets you define rules to automatically map fields based on their names or types when new data is indexed.

beginner

How do dynamic templates help when indexing unknown fields?

They automatically apply mapping rules so you don't have to manually define every new field, saving time and avoiding errors.

intermediate

Which key is used to specify the matching criteria in a dynamic template?

The match or match_mapping_type keys are used to specify which fields the template applies to.

intermediate

What does the mapping section define inside a dynamic template?

It defines the actual field mapping settings like type, analyzer, or index options to apply to matched fields.

advanced

Can dynamic templates override explicit mappings in Elasticsearch?

No, explicit mappings always take priority over dynamic templates.

What is the main purpose of dynamic templates in Elasticsearch?

A Optimize search queries

B Manually define each field mapping

C Delete old index data

D Automatically map fields based on rules

Dynamic templates automatically map fields based on matching rules, saving manual work.

Which key would you use to match fields by their data type in a dynamic template?

A match_name

B match_mapping_type

C mapping_type

D field_type

The match_mapping_type key matches fields by their data type.

If a field has an explicit mapping, what happens when a dynamic template also matches it?

A Both mappings are merged

B Dynamic template overrides explicit mapping

C Explicit mapping overrides dynamic template

D An error occurs

Explicit mappings always take priority over dynamic templates.

Which section inside a dynamic template defines how matched fields are mapped?

A mapping

B match

C template

D settings

The mapping section defines the field mapping settings.

Dynamic templates are useful when:

A You want to apply rules to unknown fields

B You want to delete fields automatically

C You know all fields in advance

D You want to disable indexing

Dynamic templates apply rules to fields that are unknown at index time.

Explain how dynamic templates work in Elasticsearch and why they are useful.

Think about how Elasticsearch handles new fields without explicit mappings.

Describe the priority between explicit mappings and dynamic templates when both apply to a field.

Consider which mapping Elasticsearch trusts more.