How to migrate Embedded Data in drupal 9

 Step 1: We need to install the Migrate Plus module and enable it.

Step 2: Created the vocabulary and the name of the vocabulary "Migration demo showcase"

• Click on the list term
• Added the term

Step 3: Create the custom module custom/migration_feature

1. migration_features.info.yml 

name: Migration features

description: Demo of migration features

core: 8.x

core_version_requirement: ^8 || ^9

packages: Demo Migrations Features

type: module

dependencies:

  - migrate_plus:migrate_plus

  - drupal:migrate

2. migrate_term_simple_way.yml

migrate_term_simple_way.yml

id: migrate_term_simple_way

label: To migrate terms in simple way

source:

  plugin: embedded_data

  data_rows:

    - name: voc1

      desc: voc1 desc

      parent: NULL

    - name: voc2

      desc: voc2 desc

      parent: NULL

    - name: voc3

      desc: voc3 desc

      parent: 1

  ids:

    name:

      type: string

process:

  name: name

  description: desc

  parent: parent  

  vid:

    plugin: default_value

    default_value: migration_demo_showcase

destination:

  plugin: 'entity:taxonomy_term'

Step:4 Now enable the custom module and follow the CMD steps

1. composer require drush/drush

2. drush cr

3. drush migrate:import migrate_term_simple_way

Step 5: Output of Parent id wise migration

Step 6: Rollback the taxonomy term so you can rollback commands like

1. drush migrate:rollback migrate_term_simple_way

Step7: Output of Parent Name-wise migration

1. migration_lookup.yml

id: migrate_term

label: migrating terms

source:

  plugin: embedded_data

  data_rows:

    - name: voc1

      desc: voc1 desc

      parent: NULL

    - name: voc2

      desc: voc2 desc

      parent: NULL

    - name: voc3

      desc: voc3 desc

      parent: voc1

  ids:

    name:

      type: string

process:

  name: name

  description: desc

  parent:

    plugin: migration_lookup

    migration: migrate_term

    source: parent

  vid:

    plugin: default_value

    default_value: migration_demo_showcase

destination:

  plugin: 'entity:taxonomy_term'

2. Run the command 

drush migrate:import migrate_term

Output

Step 8: For example both migration files compare.