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How to sub_process a non-associative array in migration.yml

I know I can use sub_process to iterate over an associative array like

field_categories:   plugin: sub_process   source: remote_categories   process:     target_id:       plugin: migration_lookup       migration: my_existing_taxonomy_migration       source: name_of_key

But I don’t know how to iterate over a numeric / non-associative array. Assume the JSON data structure

{   remote_categories: [ 'alpha', 'beta', 'gamma' ] }

how can I pass the values as keys to migration_lookup? I.e. what would be name_of_key in the example above?

This article was republished from its original source.
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How to sub_process a non-associative array in migration.yml

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