Indexes

README.md

@@ -330,3 +330,69 @@ Returns:
 { "_id" : "Charmander", "total" : 20 }
 ```
 [More SQL vs Mongo examples](https://docs.mongodb.com/manual/reference/sql-aggregation-comparison/)
+
+# Indexes for faster searching
+Get indexes of a collection:
+```
+> db.pokemons.getIndexes()
+```
+It will return `_id` because it's the index by default
+```
+[{
+  "v" : 2,
+  "key" : {
+    "_id" : 1
+  },
+  "name" : "_id_" 
+}]
+```
+
+## Create an index
+Create type text index
+```
+> db.pokemons.createIndex({name: "text"})
+```
+Will return
+```
+{
+        "numIndexesBefore" : 1,
+        "numIndexesAfter" : 2,
+        "createdCollectionAutomatically" : false,
+        "ok" : 1
+}
+```
+And now we will get more indexes:
+```
+> db.pokemons.getIndexes()
+
+[
+        {
+                "v" : 2,
+                "key" : {
+                        "_id" : 1
+                },
+                "name" : "_id_"
+        },
+        {
+                "v" : 2,
+                "key" : {
+                        "_fts" : "text",
+                        "_ftsx" : 1
+                },
+                "name" : "name_text",
+                "weights" : {
+                        "name" : 1
+                },
+                "default_language" : "english",
+                "language_override" : "language",
+                "textIndexVersion" : 3
+        }
+]
+```
+
+## Searching by text
+```
+> db.pokemons.find({$text: {$search: "Pikachu"}})
+
+{ "_id" : ObjectId("61422737f096f662d9ea826d"), "name" : "Charmander", "level" : 20, "pokedexId" : 2, "type" : [ "fire" ] }
+```