PHP Mongo: Search for a particular text in whole collection

Question

I want to get all documents that have a specific word either in any nested json. A document in collection looks like this;

Man:{
        First name: 'F-Name'
        Last name: 'L-Name'
        hobbies:{
            sports:'cricket'
            watching: 'films'
        }
        Likeness:{
            name: 'F-name'
            fruit: 'chikoo'
        }
    }

and there are multiple such documents in collection. For example I want to find all the documents that have word F-name. See in the above json. F-name is in 2 nested jsons. But it can be in only one or multiple. What is speedy and intelligent way for finding all that documents rather than giving any field or nested Json name (First name, Likeness->name in above case). Is there any way?

$mng = new MongoDB\Driver\Manager("mongodb://localhost:27017");
$filter = [ ?? ];
$query = new MongoDB\Driver\Query($filter);     
$res = $mng->executeQuery("Database.myName", $query);

Edit 1 On the suggestion of @Shail Paras I run the following code;

<?php
    $mng = new MongoDB\Driver\Manager("mongodb://localhost:27017");
    $query = new \MongoDB\Driver\Query(['createIndex' => ['*' => 'text']]);
    $res = $mng->executeQuery("BBC_Database.BBC", $query);
    $filter = ['$text' => ['$search' => "\"F-name\""]];
    $query1 = new MongoDB\Driver\Query($filter);     
    $cursor = $mng->executeQuery("Database.Col", $query1);
    $filteredData = iterator_to_array($cursor);
    echo "<pre>";
    print_r($filteredData);
?>

But it gives;

Fatal error: Uncaught exception 'MongoDB\Driver\Exception\RuntimeException' with message 'text index required for $text query' in C:\wamp64\www-------filename.php on line 7

What is text index according to the error?

Answer 1

Ok.. That is the error of Text Search because text search only works if indexing is created, and i think your indexing part is not working. that's why it is throwing that exception. and I'm sorry for being in hurry. but Here is your solution:

Step 1 : Create Indexes in All Documents using Command

$manager = new MongoDB\Driver\Manager("mongodb://127.0.0.1:27017");
$command = new MongoDB\Driver\Command([
    "createIndexes" => "Col",
    "indexes"       => [[
        "name" => "indexName",
        "key"  => ["$**" => "text"],
        "ns"   => "Database.Col",
    ]],
]);
$result = $manager->executeCommand("Database", $command);
var_dump($result->toArray()); // this will show u indexing result

Step 2 : Run Your query

$filter = ['$text' => ['$search' => "\"F-name\""]];
$query1 = new MongoDB\Driver\Query($filter);     
$cursor = $manager->executeQuery("Database.Col", $query1);
$filteredData = iterator_to_array($cursor);
echo "<pre>";
print_r($filteredData);

Hope this can help you and if it did, then don't forget to read these articles:

Text Search & Text Indexes