Issue #538: Some properties in ES Application.properties use environment variables

[DmitryPuhovsky]

Resolves issue #538

The following values in the application.properties file were changed for use evironment variables:

• elasticsearch.client.url=${ES_CLIENT_URL}
• elasticsearch.client.port=${ES_CLIENT_PORT}
• database.url=${PGS_URL}
• database.username=${PGS_USER}
• database.password=${PGS_PASS}
• cloud.pipeline.host=${API}
• cloud.pipeline.token=${API_TOKEN}