Which of the following actions may be necessary before installing ES?

According to the Splunk Enterprise Security documentation, one of the actions that may be necessary before installing ES is to redirect distributed search connections. This action is required if you are installing ES on a search head that is already connected to a distributed search environment, such as a search head cluster or a search head pool. You need to redirect the distributed search connections from the existing search head to a new search head that will run ES. This is because ES requires a dedicated search head that is not shared with other apps or users. You can use the Distributed Configuration Management tool to redirect the distributed search connections and create a Splunk Enterprise Security app for indexers. See Redirect distributed search connections for more details.

The other actions are not necessary before installing ES, but they may be helpful for optimizing the performance and scalability of ES. Purging KV Store can free up some disk space and remove stale data, but it is not required before installing ES. See Purge the KV Store for more information. Adding additional indexers can improve the indexing and searching capacity of ES, but it is not required before installing ES. See Deployment planning for more information. Adding additional forwarders can increase the data ingestion and forwarding capability of ES, but it is not required before installing ES. See Forward data to Splunk Enterprise Security for more information. References =

Redirect distributed search connections

Purge the KV Store

Deployment planning

Forward data to Splunk Enterprise Security.