private IndexShard createNewShard(final IndexShardKey indexShardKey) {
            final String thisNodeName = nodeInfo.getThisNodeName();
            LOGGER.debug("Creating shard for key {} on {}", indexShardKey, thisNodeName);
            return indexShardCreator.createIndexShard(indexShardKey, thisNodeName);
        }
Creates a new index shard writer for the specified key and opens a writer for it.
stroom-index/stroom-index-impl/src/main/java/stroom/index/impl/ActiveShardsCacheImpl.java