Docs: Changing ES_MAX_MEM default from '1gb' to '1g'
Docs: Changing ES_MAX_MEM default from '1gb' to '1g'

If you set ES_HEAP_SIZE to '1gb' as suggested, Java will yield an "Invalid initial heap size".

Closes #6824

fubuki/elasticsearch,aparo/elasticsearch,aparo/elasticsearch,aparo/elasticsearch,aparo/elasticsearch,aparo/elasticsearch,fubuki/elasticsearch,fubuki/elasticsearch,fubuki/elasticsearch,fubuki/elasticsearch,fubuki/elasticsearch,aparo/elasticsearch