How to increase Google indexing?

[Tom Evans]

Can any one tell me about google indexing process for Ecommerce websites with huge inventory.
I'm working on a client's e-commerce site which recently got a CMS update including URL updates. Performed a lot of 301's on the old url's. Now the question- Not all pages/urls get indexed by Google (there are around 13,000 urls, of which 9,500 are indexed only rest are not in google search engine result pages).

Is there any tips to increase indexing status?

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