best practices: exceptions during opensearch indexing

[TanyaStere42]

as part of the opensearch integration of Wildbook, there's been a lot of cleanup work and strengthening of the system. Now it's time to treat exception-catching as a non-functional requirement (WildMeOrg/Wildbook#842)

Sign off:

• clear description of what needs to happen
• example code snippet if possible
• currently code standards are all in one place (docs/contribute/code-guide.md)