Search results for custom content not present - ISearchableContentType

Hi,

I trying to implement SearchableContentType from custom application.
created ISearchableContentType plugin and added the .dll in to the Job folder.
Search box return the results of comments only (from custom application) because that is stored in default table (te_Comment_Comments)
but it also have the content like company and product these data are stored in the custom table with IsIndex column.
Data in the custom table are not get indexed. So, it is not listing in the search list. What else I am missing to get the custom search results from custom table

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