update job to set default index for timeline visualizations

[markdboyd]

Changes proposed in this pull request:

Fixes #145

• update job to set default index for timeline visualizations, otherwise users get permission errors trying to visualize data from other indices which they cannot access

Things to check

• For any logging statements, is there any chance that they could be logging sensitive data?
• Are log statements using a logging library with a logging level set? Setting a logging level means that log statements "below" that level will not be written to the output. For example, if the logging level is set to INFO and debugging statements are written with log.debug or similar, then they won't be written to the otput, which can prevent unintentional leaks of sensitive data.

Security considerations

These changes do not increase permissions, they update the visualization settings to only read data from the default index where their logs are stored.

[JasonTheMain]

amazing work mark!!!