How to index Magento2 without waiting for cron

Run this command from your magento root directory

reindex all : php bin/magento indexer:reindex

reindex single index : php bin/magento indexer:reindex indexer_name

Where indexer_name Could be
catalog_category_product,catalog_product_category,catalog_product_price,catalog_product_attribute,cataloginventory_stock,catalogrule_rule,catalogrule_product,catalogsearch_fulltext.
 
Reference: http://devdocs.magento.com/guides/v2.0/config-guide/cli/config-cli-subcommands-index.html

Configure cronjob: http://devdocs.magento.com/guides/v2.0/config-guide/cli/config-cli-subcommands-cron.html#config-cli-cron-bkg

Magento2 manually reindexing. Refer to:https://github.com/magento/magento2/issues/824