Index row requires 9324 bytes maximum size is 8191

Hello,

I am trying to index a field in my database of size about 16K rows, but i m
getting this error.

" Index row requires 9324 bytes maximum size is 8191  "

Can anyone please guide me how to remove this error....

Also, average time to search for a query in a table is taking about 15
seconds. I have done indexing but the time is not reducing.....
Is there any way to reduce the time to less than 1 sec ???
The type of indexing which I am performing on the field is btree... My field
contains large text. Is there any more suitable indexing type ??

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