Asset Type Index Problem

I am facing a problem with indexing of the assets. I created an asset type index for a certain asset and I have a Template that use this index to search for this asset. When I create new asset from this type on the management server the index is working fine and when I search for that asset the new created items shown to me. But I am facing problem when I publish the created assets to the delivery server, the published assets not shown I must re-index the asset manually through the admin to make them shown.

Thanks,

Tamer Shakwy