logstash/docs/reference/transforming-data.md

mapped_pages
https://www.elastic.co/guide/en/logstash/current/transformation.html

Transforming data [transformation]

With over 200 plugins in the Logstash plugin ecosystem, it’s sometimes challenging to choose the best plugin to meet your data processing needs. In this section, we’ve collected a list of popular plugins and organized them according to their processing capabilities:

• Performing Core Operations
• Deserializing Data
• Extracting Fields and Wrangling Data
• Enriching Data with Lookups

Also see Filter plugins and Codec plugins for the full list of available data processing plugins.