How to use multiple array index in $unwind using MongoDB? - mongodb

Question

I have following query where I am using same array index for three fields. But query response is incorrect because of using same arra index. Using query as follows
$pipeline = array(
array(
'$project' => array(
'YPhaseVoltage' => 1,
'RPhaseVoltage' => 1,
'EventTS' => 1
)
),
array(
'$unwind' => array(
'path' => '$RPhaseVoltage',
'includeArrayIndex' => "arrayIndex",
'preserveNullAndEmptyArrays' => true
)
),
array(
'$unwind' => array(
'path' => '$YPhaseVoltage',
'includeArrayIndex' => "arrayIndex",
'preserveNullAndEmptyArrays' => true
)
),
array('$match' => array(
'$and' => array(
array("RPhaseVoltage" => array('$ne' => null)),
array("YPhaseVoltage" => array('$ne' => null))
)
),
),
array(
'$project' => array(
'_id' => 0,
'RPhaseVoltage' => 1,
'YPhaseVoltage' => 1,
'RYBTimestamp' => array(
'$add' => array(
array('$subtract' => array('$EventTS', $default_date)),
array('$multiply' => array( 60000, '$arrayIndex' ))
)
)
)
),
array(
'$project' => array(
'rvoltage_data' => array('$RYBTimestamp', '$RPhaseVoltage'),
'yvoltage_data' => array('$RYBTimestamp', '$YPhaseVoltage'),
'RYBTimestamp' => 1
)
),
array(
'$sort' => array('RYBTimestamp' => 1),
),
array(
'$limit' => 50
)
);
$result = $collection->aggregate($pipeline);
I want to use individual array index for each filed. Which gives me expected response. Please suggest me how to use multiple array index in mongodb aggregate?