Add docs on replicating APM Server or Beats indices (#36333)
Add docs on replicating APM Server or Beats indices (#36333)

This commit adds a brief note to the documentation on how to manage the
index templates that are used to create APM Server and Beats indices.
strapdata/elassandra,strapdata/elassandra,strapdata/elassandra,strapdata/elassandra,vroyer/elassandra,vroyer/elassandra,strapdata/elassandra,vroyer/elassandra