public void setShardInstanceCount(Integer shardInstanceCount) {
        this.shardInstanceCount = shardInstanceCount;
    }
<p>
The number of replica instances applying to all shards in the cluster. A <code>shardInstanceCount</code> value of
1 means there is one writer instance, and any additional instances are replicas that can be used for reads and to
improve availability.
</p>

@param shardInstanceCount
       The number of replica instances applying to all shards in the cluster. A <code>shardInstanceCount</code>
       value of 1 means there is one writer instance, and any additional instances are replicas that can be used
       for reads and to improve availability.
aws-java-sdk-docdbelastic/src/main/java/com/amazonaws/services/docdbelastic/model/Cluster.java