What is the default replication policy in Elasticsearch? Does it push
changes to replicas asynchronously or synchronously? Or does it use
different mode with different operations.
By default, the index operation only returns after all shards within the
replication group have indexed the document (sync replication).
optimistic concurrency control
Elasticsearch is distributed. When documents are created, updated or
deleted, the new version of the document has to be replicated to other
nodes in the cluster. Elasticsearch is also asynchronous and concurrent
This book Ealsticsearch Definitive Guide, states under 'Creating, indexing
and deleting' that "...default value for replication is synchronous". When
discussing 'update' API it is stated that "...these changes are forwarded
to the replica shards asynchronously...."
*** The default value for replication is sync. This causes the primary
shard to wait for successful responses from the replica shards before
Document based replication
When a primary shard forwards changes to its replica shards, it doesn’t
forward the update request. Instead it forwards the new version of the full
document. ***Remember that these changes are forwarded to the replica
shards asynchronously and there is no guarantee that they will arrive in
the same order that they were sent.
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