How to count if Number is below than 10 sum

AFAIK You can´t do this with your aggregation query. Launch the query and, by code, check the count.

Follow the Example.

Example: PHP

<?php
$data = 5;
 if ( $data < 10 ){
    echo 'Below';
 } else {
    echo 'Upper';
 }
?>

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PHP String Tutorial

Reffered: https://stackoverflow.com/questions/23730985/allow-insertion-only-if-count-is-less-than-10