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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def format_doc(hit, schema, dates):
 """Format given doc to match given schema."""

    doc = hit.get('_source', {})
    doc.setdefault(config.ID_FIELD, hit.get('_id'))
    doc.setdefault('_type', hit.get('_type'))
    if hit.get('highlight'):
        doc['es_highlight'] = hit.get('highlight')

    if hit.get('inner_hits'):
        doc['_inner_hits'] = {}
        for key, value in hit.get('inner_hits').items():
            doc['_inner_hits'][key] = []
            for item in value.get('hits', {}).get('hits', []):
                doc['_inner_hits'][key].append(item.get('_source', {}))

    for key in dates:
        if key in doc:
            doc[key] = parse_date(doc[key])

    return doc