I am looking to migrate only customer data from magento 1.4 to magento 2.1, however there are few custom eav attributes for customers i want to copy over but i don't want to copy the rest of custom eav attributes.
I think customer migration will copy all custom attribute value over but it will maintain the attribute id from magento 1 database, for example in the table customer_entity_int in magento 2 db it will have the record but with the attribute id will be the same with magento 1, therefore without complete migration of eav attributes those attribute_id won't match each other.
so i assume i will need to run eav attribute migration steps with selected attribute only (but also maintain the attribute id? -- not sure if this is possible), can any one give some suggestions please? as what i can see so far the mapping file only handles db table and columns.