This really depends on your environments configuration. If your indexers are separate where you are using indexer clustering but want to have multiple copies of the data
output.conf config example.
[tcpout]
defaultGroup=indexer1,indexer2
[tcpout:indexer1]
server=10.1.1.197:9997
[tcpout:indexer2]
server=10.1.1.200:9997
Then there is no load balancing to take place as you only have data going to each of your indexers at the same time.
However if you have indexer clustering where your indexers are making copies of your data for you. Or you have no need to duplicate logs to multiple environments using this example with load balancing prevents several forwarders from sending data to one indexer because indexers have no communication to the clients that they are loaded other than to stop receiving data.
Outputs.conf Example:
[tcpout]
defaultGroup=my_indexers
[tcpout:my_indexers]
server=mysplunk_indexer1:9997, mysplunk_indexer2:9996
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