[8.14] Fix IOOBE in TTest aggregation when using filters #109051
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There is a corner case in the TTEst aggregation where we are throwing an IOOBE becuase we are not checking properly the bounds of the arrays. It happens when using filters on the aggregation and the aggregation is a sub-aggregation. Then one of the TTestStats can be empty which my mean that the array might have not been grown. When reading it, we don't check the current range. This commit makes sure we only read the state if it exist in the array.
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There is a corner case in the TTEst aggregation where we are throwing an IOOBE becuase we are not checking properly the bounds of the arrays. It happens when using filters on the aggregation and the aggregation is a sub-aggregation. Then one of the TTestStats can be empty which my mean that the array might have not been grown. When reading it, we don't check the current range.
This commit makes sure we only read the state if it exist in the array.
Backport #109034