You need to have outputs.conf file on your Indexer Master. In that file, turn off indexing and configure it to forward to your indexers. In other words, outputs.conf should be similar to the one you have on your forwarders.
Following is a sample configuration:
[indexAndForward]
index = false
[tcpout]
defaultGroup =clustered_indexers
forwardedindex.filter.disable = true
indexAndForward = false
[tcpout:clustered_indexers]
autoLB = true
compressed = true
server = 10.37.20.38:9997,10.37.20.28:9997
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