Updated Version of Keyhole Script to get rid to index summary errors ..

updatedKeyhole.js

// Copyright 2020 Kuei-chun Chen. All rights reserved.
var cluster = GetClustersSummary()
var data = JSON.stringify(cluster);
print(data);

function GetClustersSummary() {
  var cluster = { "cluster": "standalone", "databases": [], 
    "keyhole": { "version": "v2.5.0-js", "collected": new Date(), "logs": [] } };
  cluster["keyhole"]["logs"].push(new Date().toISOString()+" keyhole.js began");
  var doc = db.serverStatus();
  cluster["host"] = doc["host"];
  cluster["process"] = doc["process"];
  cluster["hostInfo"] = db.getSisterDB("admin").runCommand({ "hostInfo": 1 });
  cluster["getCmdLineOpts"] = db.getSisterDB("admin").runCommand({ "getCmdLineOpts": 1 });
  cluster["buildInfo"] = db.getSisterDB("admin").runCommand({ "buildInfo": 1 });
  cluster["serverStatus"] = db.getSisterDB("admin").runCommand({ "serverStatus": 1 });
  if (cluster["cluster"] == "replica") {
    cluster["replSetGetStatus"] = db.getSisterDB("admin").runCommand({ "replSetGetStatus": 1 });
  }
  if (doc["process"] == "mongos") {
    cluster["cluster"] = "sharded";
    var shards = db.getSisterDB("admin").runCommand({ "listShards": 1 });
    cluster["shards"] = shards["shards"];
  } else if (doc["repl"] != null) {
    cluster["cluster"] = "replica";
    var node = { "host": doc["host"], "oplog": GetOplogStats() };
    var shard = { "_id": doc["repl"]["setName"], "servers": [] };
    node["buildInfo"] = cluster["buildInfo"];
    node["hostInfo"] = cluster["hostInfo"];
    node["serverStatus"] = cluster["serverStatus"];
    shard.servers.push(node);
    cluster["shards"] = [];
    cluster["shards"].push(shard); 
  } else {
    cluster["cluster"] = "standalone";
  }
  cluster["keyhole"]["logs"].push(new Date().toISOString()+" began GetDatabases()");
  cluster["databases"] = GetDatabases();
  cluster["keyhole"]["logs"].push(new Date().toISOString()+" ended GetDatabases()");
  cluster["keyhole"]["logs"].push(new Date().toISOString()+" keyhole.js exiting");
  return cluster;
}

function GetOplogStats() {
  var oplog = {};
  var stats = db.getSisterDB("local").runCommand({ "collStats": "oplog.rs"});
	oplog["maxSize"] = Number(stats["maxSize"]);
	oplog["size"] = stats["size"];
	oplog["count"] = stats["count"];
  var firstDoc = db.getSisterDB("local").getCollection("oplog.rs").find({}, {ts: 1}).sort({ "$natural": 1}).next();
  var lastDoc = db.getSisterDB("local").getCollection("oplog.rs").find({}, {ts: 1}).sort({ "$natural": -1}).next();
  oplog["durationInSeconds"] = DB.tsToSeconds(lastDoc.ts) - DB.tsToSeconds(firstDoc.ts);
  return oplog;
}

function GetDatabases() {
  var databases = [];
  var dbnames = [ {name: "rdc"} ]; // ENTER DATABASE NAME / LIST OF DATABASES HERE
  dbnames.forEach(function(database) {
    if(database["name"] == "admin" || database["name"] == "config" || database["name"] == "local") {
      // skip
    } else {
      collections = [];
      var dbname = database["name"];
      names = db.getSisterDB(dbname).getCollectionNames();
      names.sort();
      names.forEach(function(name) {
        var firstDoc = {};
        var stats =	db.getSisterDB(dbname).runCommand( { "collStats": name });
        collections.push({"namespace": dbname+"."+name, "name": name, "document": firstDoc,
          "indexes": GetIndexesFromCollection(dbname, name), "stats": stats});
      });
      var stats = db.getSisterDB(dbname).runCommand( { "dbStats": 1 });
      databases.push({ "name": dbname, "collections": collections, "stats": stats});
    }
  });
  return databases;
}

function GetIndexesFromCollection(dbname, name) {
  var istats = db.getSisterDB(dbname).getCollection(name).aggregate([ {"$indexStats": {}} ]);
  return istats;
}