[raw/mattermost] Fix mapping for 'data.props.meeting_id'

[zhquan]

This change allows mapping the attribute data.props.meeting_id to a text type to avoid the error failed to parse field [data.props.meeting_id] of type [long] ...

Signed-off-by: Quan Zhou quan@bitergia.com

[coveralls]

Pull Request Test Coverage Report for Build 1031365268

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 82.253%

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Totals
Change from base Build 960504496:	0.02%
Covered Lines:	8667
Relevant Lines:	10537

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💛 - Coveralls