附件索引
==================================================

.. code-block:: bash

    curl -X PUT "localhost:9200/_ingest/pipeline/attachment" -H 'Content-Type: application/json' -d'
    {
        "description" : "Extract attachment information",
        "processors" : [
            {
            "attachment" : {
                "field" : "data",
                "indexed_chars" : -1
            }
            }
        ]
    }
    '

.. code-block:: bash

    curl -X PUT "localhost:9200/my_index/mydoc/2?pipeline=attachment" -H 'Content-Type: application/json' -d'
    {
        "data":" '`base64 -i in.pdf`' "
    }
    '