Elasticsearch memory problems
You have configured a virtual machine with 1 GB of RAM, but elastic is trying to start with 2 GB of RAM (default for Elasticsearch version 5.X)
Either give more memory to your VM, or change Elasticsearch JVM settings /etc/elasticsearch/jvm.options and lower the values of the following parameters: -Xms512m -Xmx512m
For the current version of elastic (5.X) you can configure jvm startup options in the jvm.options file usually located under directory /etc/elasticsearch/jvm.options:
-Xms1g -Xmx1gHope it helps.
You need to start elasticsearch by the following parameters:./bin/elasticsearch -Xmx512m -Xms512
However it seems your memory (1G) is too low for running elasticsearch.