Shards taking ages to initialize

Elastic Stack Elasticsearch
1

I have a synonyms file of around 1GB. The index has around 25 million documents. When the index is closed and then opened again, it takes almost 3 hours for the shards both primary and replicas to be allocated.

Number of primary shards: 7
Number of replica shards: 14

Average shard size: 20GB.

Output of hot_threads is as given https://pastebin.com/ipTVjd8A

Thanks.

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What version are you on?

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@warkolm Elasticsearch version: 2.4.5

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