ui.modern.extra_search_cpu_count_percentage

This limits the concurrency of extra searches to a percentage of the available cores. For example if the machine has 4 processors and this is set to '75' then a single search can execute at most 3 extra searches concurrently. The value is always rounded down if set to '99' on a 4 core machine we will use 3 processors.

A minimum of 1 processor will always be used.

Set this configuration key in the results page (preferred) or search package configuration.

Use the configuration key editor to add or edit the ui.modern.extra_search_cpu_count_percentage key, and set the value. This can be set to any valid Double value.

Use 50% of the available processors:

Use all but one of the processors (on a machine with 100 or less processors):

Uses 1 processors for extra searches no matter how many processors the machine has.