Cosmos DB Stored Procedure to update all documents based on query with a new property called inventoryStatus. Change lines 27 and 37 to create a different property.

stored-proc.js

function addProperty(continuationToken) {
    var response = getContext().getResponse();
    var collection = getContext().getCollection();
    var updated = 0;

    if (continuationToken) {   //  Parse the token
        var token = JSON.parse(continuationToken);

        if (!token.queryContinuationToken) {
            throw new Error('Bad token format:  no continuation');
        }
        
        updated = token.updatedSoFar;
        query(token.queryContinuationToken);
    }
    else {
        query();
    }

    //  Function within the main stored procedure function
    function query(continuation) {
        var requestOptions = { continuation: continuation };

        // Query all documents in one logic partition
        var isAccepted = collection.queryDocuments(
            collection.getSelfLink(),
            'SELECT * FROM root r WHERE not is_Defined(r.inventoryStatus)',
            requestOptions,
            function (err, feed, responseOptions) {
                if (err) throw err;
                
                if (!feed || !feed.length) {
                    response.setBody('no docs found');
                }
                else {
                    feed.forEach(element => {
                        element.inventoryStatus = "active";
                        collection.replaceDocument(element._self, element, function (err) {
                            if (err) throw err;
                        })
                        updated++
                    })
                }

                if (responseOptions.continuation) {
                    //  Continue the query
                    query(responseOptions.continuation)
                } else {
                    //  Return the count in the response
                    response.setBody({ count: updated, continuation: null });
                }
            });

        if (!isAccepted) {
            var sprocToken = JSON.stringify({
                updatedSoFar: updated,
                queryContinuationToken: continuation
            });

            response.setBody({ count: null, continuation: sprocToken });
        }
    }
}