I have single Splunk instance and would like to migrate to a new search head cluster and the index cluster.
I have a bunch of saved searches/dashboards/apps. is it Ok if I simply copy them to the same directories of each search head members?
Yes that will work.
One more option is to use search head deployer. Put all the things on your search head deployer under $SPLUNK_HOME/etc/shcluster/ folder. In this case you won't need to do copy on different search heads, instead push it from search head deployer.
In this folder you will have two folders users and apps. Users folder will contain all the custom changes done by different users. You can copy $SPLUNK_HOME/etc/users folder to this folder. For apps you can copy content from $SPLUNK_HOME/etc/apps folder to $SPLUNK_HOME/etc/shcluster/apps folder.
Yes that will work.
One more option is to use search head deployer. Put all the things on your search head deployer under $SPLUNK_HOME/etc/shcluster/ folder. In this case you won't need to do copy on different search heads, instead push it from search head deployer.
In this folder you will have two folders users and apps. Users folder will contain all the custom changes done by different users. You can copy $SPLUNK_HOME/etc/users folder to this folder. For apps you can copy content from $SPLUNK_HOME/etc/apps folder to $SPLUNK_HOME/etc/shcluster/apps folder.