Mongo Db search by indexed field

Question

I add field \'search_string\' to my document and index it. db.my_collection.createIndex({search_string: \"text\"}) Search_string contains this: \'a ar are aren

Answer 1

From the MongoDB manual

Match Operation

Stop Words

The $text operator ignores language-specific stop words, such as the and and in English.

Both "a" and "are" are in the list of default English language stopwords so will be ignored. A quick google search for English language stopwords will find plenty of pages with the full list.