amasty_xsearch_users_search database table very large

amasty_xsearch_users_search database table very large

We have this amasty table which is being reported by magento site analytics tool for being too large. Wish to know what's the right approach for this table, should we just keep data for last two weeks or do we need to keep data for a certain period of time for Amasty extension to keep functioning normally.

mysql> select count(*) from amasty_xsearch_users_search;
+----------+
| count(*) |
+----------+
| 14975862 |
+----------+

mysql> SELECT (data_length+index_length)/power(1024,2) tablesize_mb FROM information_schema.tables WHERE table_schema='magentoupdatetest' and table_name='amasty_xsearch_users_search';
+--------------+
| tablesize_mb |
+--------------+
|  4263.859375 |
+--------------+
1 row in set (0.01 sec)