Remove field from all docs in a CouchDB database

gistfile1.js

console.log("Fetching docs...");
var j = 0;
var docs = [];
var startdoc = '0';
function fetchdocs(){
    nano.list({ stale: "ok", startkey:startdoc, limit:2000, include_docs:true}, function(err, data, headers){ 
	console.log("Updating " + data.rows.length + " docs...");
	for (var i = 0; i < data.rows.length; i++) {
		var doc = data.rows[i].doc;
		//console.log(doc);
                if (doc.metadata && doc.metadata.host) {
		delete doc.metadata['host'];
		delete doc.metadata['content-type'];
		delete doc.metadata['x-forwarded-proto'];
		delete doc.metadata['x-forwarded-port'];
		delete doc.metadata['content-length'];
		delete doc.metadata['connection'];
		delete doc.metadata['request-time'];
		delete doc.metadata['accept-encoding'];
		delete doc.metadata['cookie'];
		docs.push(doc);
		console.log("Queueing up", doc._id);
		}

		startdoc = doc._id;
	}
        fetchdocs();
        return true;
    });
    return true;
}

fetchdocs();

setInterval(function() {
	var batch = docs.splice(0, 1000);
	if (batch.length > 0) {
	//console.log("Processing batch of size ", batch.length);
	nano.bulk({ docs: batch }, function(error, body, headers) {
		//console.log("Got a response");
		if (error) { 
			console.log(error);
			errors = errors.concat(batch);
		} else { 
			console.log("Altered " + batch.length + " docs"); 
			//console.log(body);
		}
	});
	}
}, 1000);