Dynamic resource writes does not work

We use es-hadoop in our storm topo, and get the index name from the data being streamed to Elasticsearch according to the doc.
Unfortunately, It always report an error, the variable does not exist.
My code is like

and the error is like:

I am sure I had send one json object to the 'EsBolt' and with a variable 'instance_id'.

Help me please.

Can you include the full stack trace you are seeing?

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