9 string references to 'FieldMigration'

d6_field.yml in core/modules/field/migrations/d6_field.yml
core/modules/field/migrations/d6_field.yml
d6_field_formatter_settings.yml in core/modules/field/migrations/d6_field_formatter_settings.yml
core/modules/field/migrations/d6_field_formatter_settings.yml
d6_field_instance.yml in core/modules/field/migrations/d6_field_instance.yml
core/modules/field/migrations/d6_field_instance.yml
d6_field_instance_widget_settings.yml in core/modules/field/migrations/d6_field_instance_widget_settings.yml
core/modules/field/migrations/d6_field_instance_widget_settings.yml
d7_field.yml in core/modules/field/migrations/d7_field.yml
core/modules/field/migrations/d7_field.yml
d7_field_formatter_settings.yml in core/modules/field/migrations/d7_field_formatter_settings.yml
core/modules/field/migrations/d7_field_formatter_settings.yml
d7_field_instance.yml in core/modules/field/migrations/d7_field_instance.yml
core/modules/field/migrations/d7_field_instance.yml
d7_field_instance_label_description_translation.yml in core/modules/config_translation/migrations/d7_field_instance_label_description_translation.yml
core/modules/config_translation/migrations/d7_field_instance_label_description_translation.yml
d7_field_instance_widget_settings.yml in core/modules/field/migrations/d7_field_instance_widget_settings.yml
core/modules/field/migrations/d7_field_instance_widget_settings.yml

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