ES cluster block exception?

I ran my ELK setup on a large set of data with elasticsearch default
settings but with Xms = 2G on a red hat server with 32 GB RAM, 600GB HD and
after reading around 64 lac log lines my logstash console gives the error:

Exception in thread "elasticsearch[logstash-XX-23664-4104][generic][T#6]"
org.elasticsearch.cluster.block.ClusterBlockException: blocked by:
[SERVICE_UNAVAILABLE/1/state not recovered /
initialized];[SERVICE_UNAVAILABLE/2/no master];
at
org.elasticsearch.cluster.block.ClusterBlocks.globalBlockedException(ClusterBlocks.java:138)
at
org.elasticsearch.cluster.block.ClusterBlocks.globalBlockedRaiseException(ClusterBlocks.java:128)
at
org.elasticsearch.action.bulk.TransportBulkAction.executeBulk(TransportBulkAction.java:197)
at
org.elasticsearch.action.bulk.TransportBulkAction.access$000(TransportBulkAction.java:65)
at
org.elasticsearch.action.bulk.TransportBulkAction$1.onFailure(TransportBulkAction.java:143)
at
org.elasticsearch.action.support.TransportAction$ThreadedActionListener$2.run(TransportAction.java:117)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

I am doing the load testing forst time on ELK set up. So doe sthe above
error mean ES with default settings can take only this much load?
Shall I need a another node ??

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