Write commit documents to new index

This MR allows to use a separate index for commits. It can be configured by using index_name_commits in ELASTIC_CONNECTION_INFO.

For example,

export ELASTIC_CONNECTION_INFO='{"url":["http://localhost:9200"], "index_name":"gitlab-development", "index_name_commits":"gitlab-development-commits"}'

If it's not configured, the behaviour is exactly the same as before.

Closes #87 (closed)

Edited by Dmitry Gruzd

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