How to create a 2d array of string in painless?

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I want to create a 2-d array of String data type in painless.
I have tried several versions but all of them are giving me error.

String[][] myArray = {{'abc', 'pqr'}, {'xzy', 'ljk'}}
String[][] myArray = new String[][] {{'abc', 'pqr'}, {'xzy', 'ljk'}}
myArray = {{'abc', 'pqr'}, {'xzy', 'ljk'}}

The error I am getting is - invalid sequence of tokens near...

For 1st case, it's near ['[']
For 2nd case, it's near ['[']
For 3rd, it's near ['{']

I am using Elastic Version - 6.1

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