Index patterns for time-series in Elasticsearch - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an index pattern in Elasticsearch?

An index pattern is a way to tell Elasticsearch which indexes you want to search or analyze. It uses wildcards to match multiple indexes, especially useful for time-series data that creates new indexes over time.

beginner

Why use index patterns for time-series data?

Time-series data grows by adding new indexes for each time period (like daily or monthly). Index patterns let you search across all these indexes easily without specifying each one.

beginner

Example of an index pattern for daily logs from January 2024

If your daily indexes are named like 'logs-2024.01.01', 'logs-2024.01.02', etc., the index pattern would be 'logs-2024.01.*' to match all January 2024 logs.

intermediate

How does using index patterns improve performance?

By targeting only relevant indexes with patterns, Elasticsearch avoids searching unnecessary data. This makes queries faster and reduces resource use.

beginner

What wildcard character is used in Elasticsearch index patterns?

The asterisk (*) is used as a wildcard to match any characters in index names, helping to select multiple indexes with one pattern.

What does the index pattern 'metrics-2023.*' match?

A All indexes containing 'metrics' anywhere

B Only the index named 'metrics-2023.*'

C All indexes starting with 'metrics-2023.'

D Indexes from any year

The asterisk (*) matches any characters after 'metrics-2023.', so it matches all indexes starting with that prefix.

Why are index patterns useful for time-series data?

A They create new indexes

B They compress data automatically

C They delete old indexes

D They allow searching multiple time-based indexes at once

Index patterns let you search many time-based indexes together without naming each one.

If your indexes are named 'logs-2024.06.01', 'logs-2024.06.02', which index pattern matches all June 2024 logs?

A logs-2024.07.*

B logs-2024.06.*

C logs-*

D logs-2024.*

The pattern 'logs-2024.06.*' matches all indexes for June 2024.

What symbol is used as a wildcard in Elasticsearch index patterns?

A *

B ?

C #

D %

The asterisk (*) is the wildcard symbol in Elasticsearch index patterns.

How do index patterns help with query performance?

A By limiting queries to relevant indexes only

B By increasing the number of indexes searched

C By encrypting data

D By backing up indexes

Index patterns help Elasticsearch search only the needed indexes, making queries faster.

Explain what an index pattern is and why it is important for managing time-series data in Elasticsearch.

Think about how daily or monthly data is stored and how you can search it easily.

Describe how using index patterns can improve query performance when working with large time-series datasets.

Consider what happens if you search all data vs. only relevant parts.