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		@@ -832,6 +832,25 @@ product.reindex
832	product.reindex_async	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	Remove old indices	854	Remove old indices
836		855
837	```ruby	856	```ruby