[
{
$addFields: {
words: {
$map: {
input: { $split: ['$description', ' '] },
as: 'str',
in: {
$trim: {
input: { $toLower: ['$$str'] },
chars: " ,|(){}-<>.;"
}
}
}
}
}
},
{ $unwind: '$words' },
{
$match: {
words: {
$nin: ["", "also", "i", "me", "my", "myself", "we", "us",
"our", "ours", "ourselves", "you", "your", "yours",
"yourself", "yourselves", "he", "him", "his",
"himself", "she", "her", "hers", "herself", "it",
"its", "itself", "they", "them", "their", "theirs",
"themselves", "what", "which", "who", "whom", "whose",
"this", "that", "these", "those", "am", "is", "are",
"was", "were", "be", "been", "being", "have", "has",
"had", "having", "do", "does", "did", "doing", "will",
"would", "should", "can", "could", "ought", "i'm",
"you're", "he's", "she's", "it's", "we're", "they're",
"i've", "you've", "we've", "they've", "i'd", "you'd",
"he'd", "she'd", "we'd", "they'd", "i'll", "you'll",
"he'll", "she'll", "we'll", "they'll", "isn't",
"aren't", "wasn't", "weren't", "hasn't", "haven't",
"hadn't", "doesn't", "don't", "didn't", "won't",
"wouldn't", "shan't", "shouldn't", "can't", "cannot",
"couldn't", "mustn't", "let's", "that's", "who's",
"what's", "here's", "there's", "when's", "where's",
"why's", "how's", "a", "an", "the", "and", "but",
"if", "or", "because", "as", "until", "while", "of",
"at", "by", "for", "with", "about", "against",
"between", "into", "through", "during", "before",
"after", "above", "below", "to", "from", "up", "upon",
"down", "in", "out", "on", "off", "over", "under",
"again", "further", "then", "once", "here", "there", "when",
"where", "why", "how", "all", "any", "both", "each",
"few", "more", "most", "other", "some", "such", "no",
"nor", "not", "only", "own", "same", "so", "than",
"too", "very", "say", "says", "said", "shall"]
}
}
}
]