Update README.md

Daniel Ferraz
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README.md
@@ -832,6 +832,25 @@ product.reindex
 product.reindex_async
 ```
  
+Reindex more than one record without recreating the index
+
+```ruby
+# do this ...
+some_company.products.each { |p| p.reindex }
+# or this ...
+Product.searchkick_index.import(some_company.products)
+# don't do the following as it will recreate the index with some_company's products only
+some_company.products.reindex
+```
+
+Reindex large set of records in batches
+
+```ruby
+Product.where("id > 100000").find_in_batches do |batch|
+  Product.searchkick_index.import(batch)
+end
+```
+
 Remove old indices
  
 ```ruby
...	...	@@ -832,6 +832,25 @@ product.reindex
832	832	product.reindex_async
833	833	```
834	834
	835	+Reindex more than one record without recreating the index
	836	+
	837	+```ruby
	838	+# do this ...
	839	+some_company.products.each { \|p\| p.reindex }
	840	+# or this ...
	841	+Product.searchkick_index.import(some_company.products)
	842	+# don't do the following as it will recreate the index with some_company's products only
	843	+some_company.products.reindex
	844	+```
	845	+
	846	+Reindex large set of records in batches
	847	+
	848	+```ruby
	849	+Product.where("id > 100000").find_in_batches do \|batch\|
	850	+ Product.searchkick_index.import(batch)
	851	+end
	852	+```
	853	+
835	854	Remove old indices
836	855
837	856	```ruby
...	...