If xpack.ml.use_auto_machine_memory_percent is not explicitly set to true then
the default value (false) means ML will only use 30% of the available memory making
it impractical to run the ELSER model. This is useful for users wanting to get started
with semantic search.The single node docker instructions have been updated with a
command that gives the container enough memory to run the ELSER model and enables xpack.ml.use_auto_machine_memory_percent. For the multi-node guide the docker
compose file is updated to enable the ml setting for every node in the cluster.
