How to check a doc field exist while creating scripted field using painless

if (doc.containsKey('fieldname')  {
  return 0; 
else {
  return 1;

The above code return compile error in kibana and ES 5.2.0.
What is the correct syntax of painless to check if a field exists?

My solution:
After searching a while, find that

A boolean indicating if the field has no values within the doc.

will return true if the field does not exist on the records.


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what about if (doc['fieldname']) ?

if (doc['fieldname'])

It return a warning "Courier Fetch: 5 of 5 shards failed." when I search *. And no result return.

The following error found in elasticsearch.log

Caused by: java.lang.ClassCastException: org.elasticsearch.index.fielddata.ScriptDocValues$Strings cannot be cast to java.lang.Boolean

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