shared_roster_ldap_user caching options

Hi everybody, I am using ejabberd with ldap authentication and shared roster, however it shows a warning every time a user log into the server:

Any hints on where to put cache options ?

2017-02-13 11:59:06.808 [error] <0.409.0> shrinking table:
** Table: shared_roster_ldap_user
** Processes Number: 2
** Max Size: 500 items
** Shrink Size: 250 items
** Life Time: 300000000 microseconds
** Hits/Miss: 0/3129
** Owner: <0.408.0>
** Cache Missed: true
** Instruction: you have to tune cacheing options if this message repeats too frequently

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