Merge pull request #79 from algoliareadmebot/master

Update README

Author: LeoErcolanelli

README.md

@@ -657,6 +657,10 @@ print settings
 index.set_settings({"customRanking": ["desc(followers)"]})
 ```
 
+**Warning**
+
+Performance wise, it's better to do a `` before pushing the data
+
 #### Slave settings
 
 You can forward all settings updates to the slaves of an index by using the `forwardToSlaves` option:
@@ -1753,7 +1757,7 @@ The move_index method will overwrite the destination index, and delete the tempo
 
 **Warning**
 
-The move_index` operation will override all settings of the destination,
+The move_index operation will override all settings of the destination,
 There is one exception for the [slaves](#slaves) parameter which is not impacted.
 
 For example, if you want to fully update your index `MyIndex` every night, we recommend the following process: