Elasticsearch: Using Collections class method in groovy script

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Hi All,

I am trying to use Collections class for some processing to create an entity centric index. But when I use the methods of collections class I get the below error:

Caused by: groovy.lang.MissingPropertyException: No such property: Collections for class

However, my code runs in grrovy compiler the way I want it to. Any idea why this is coming up and how I can solve it.
Thanks in advance.

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