Is it possible to done search indexing locally, then upload it? I want to perform search items indexing on the local system . 
Due to high number of items and And slowing down the server

Can I do something like this ,  then I upload the result to the DB?
Without completely erasing the previous database.just replacing drupal's index.
The suggestions in the comments are good, specially using solr.

But in your case you can index the whole data locally, and dump these three tables: search_dataset, search_index, search_total and then import it on the server.