updated elasticsearch config

uncommented to copy configuration
cp $ROOT/etc/elasticsearch/elasticsearch.yml .

removed as not used anymore
#cp $ROOT/default/elasticsearch /etc/default/elasticsearch

added to perform inline edits
sed -i 's/#LOG_DIR=/LOG_DIR=/g' /etc/default/elasticsearch
sed -i 's/#DATA_DIR=/DATA_DIR=/g' /etc/default/elasticsearch
sed -i 's/#WORK_DIR=/WORK_DIR=/g' /etc/default/elasticsearch
sed -i 's/#CONF_DIR=/CONF_DIR=/g' /etc/default/elasticsearch
sed -i 's/#CONF_FILE=/CONF_FILE=/g' /etc/default/elasticsearch