Use a sane value for max_children
Use a sane value for max_children

As explained in that blog post [1], setting a high value for
max_children won’t improve perf. Instead, let’s allow Manticore
to decide on the value (should be 1.5x the number of CPU cores).

[1] https://manticoresearch.com/2018/11/09/threads-in-manticore-search/

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