Since you are not giving a document id while indexing your document, you have to get the auto-generated document id from the return value and delete according to the id. Or you can define the id yourself, try the following:
db.index(index="reestr",doc_type="some_type",id=1919, body=doc)
db.delete(index="reestr",doc_type="some_type",id=1919)
In the other case, you need to look into return value;
r = db.index(index="reestr",doc_type="some_type", body=doc)
# r = {u'_type': u'some_type', u'_id': u'AU36zuFq-fzpr_HkJSkT', u'created': True, u'_version': 1, u'_index': u'reestr'}
db.delete(index="reestr",doc_type="some_type",id=r['_id'])
Another example for delete_by_query. Let’s say after adding several documents with name=”Jacobian”, run the following to delete all documents with name=”Jacobian”:
db.delete_by_query(index='reestr',doc_type="some_type", q={'name': 'Jacobian'})