Disappearing log records: what can I do?

hello group,

I have the following stack:
fluentd (td-agent 2.1.3), elasticsearch (1.4.4), kibana (3.1.2)
to manage the logging of an in-company application.

At first glance, this seems to work OK, but it appears that from time to
time, the reported records in kibana don't match the line count of the

Diving into this, it appears that when very large logfile are put in the
flluentd logdirectory, not all records show up in elasticsearch. This does
not show up in the logging of either fluentd or elasticsearch, so at first
glance, everyting seems fine. I started with looking at fluentd and managed
to get extra information, which seems to indicate that all of the log lines
are processed.

When comparing the wc -l of the logfile and the contents of ES, the
difference becomes visible:
ES: 645551 wc: 647506 groot.log

Looking at the thread pool statistics with the REST api, ES reports 60

Right now, I have a very simple configuration.
cluster.name: cwc-dev
index.number_of_replicas: 0
index.indexing.slowlog.threshold.index.warn: 10s
index.indexing.slowlog.threshold.index.info: 5s
index.indexing.slowlog.threshold.index.debug: 2s
path.data: /data/elasticsearch

I hope you can support me on how to tackle this, since I am quite new to
ES. So I don't know which ways are available to get extra information on

thanks in advance, Ruud

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