As far as I know, the higher you set the value, the faster the indexing
process will be (because more things are kept in memory). But depending on
which are your needs, it may not be the best option. If you set a high
mergeFactor and you want to optimize the index once the process is done,
this optimization process will take longer than if the merge factor was very
low.
This is because optimization process compacts many segment files. If
mergeFactor is lower, there will be less files so optimize will be faster.
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