The main differences we found between the two traces were pieces like this:
[2017-01-12 15:39:37,595][TRACE][index.shard ] [node-5] [logs_2015-08_performance_0][2] skip writing shard state, has been written before; previous version: [4] current version [4]
[2017-01-12 15:39:37,595][TRACE][index.shard ] [node-5] [logs_2015-08_performance_0][26] skip writing shard state, has been written before; previous version: [4] current version [4]
[2017-01-12 15:39:37,595][TRACE][index.shard ] [node-5] [logs_2015-08_performance_0][18] skip writing shard state, has been written before; previous version: [4] current version [4]
.......
[2017-01-12 15:40:00,371][TRACE][transport.tracer ] [node-5] [2015940][indices:data/write/bulk[s]] sent error response (error: [[node-5][10.75.114.160:9305][indices:data/write/bulk[s][p]]])
[2017-01-12 15:40:00,371][TRACE][transport.tracer ] [node-5] [2015949][indices:data/write/bulk[s]] received request
[2017-01-12 15:40:00,371][TRACE][transport.tracer ] [node-5] [1995643][indices:data/write/bulk[s][p]] received response from [{node-5}{IOKuMzJbRjesv8NInGiuBQ}{10.75.114.160}{10.75.114.160:9
305}{ips_id=6D46:6324, master=false}]
[2017-01-12 15:40:00,375][TRACE][indices.breaker.request ] [request] Adjusted breaker by [16440] bytes, now [16440]
[2017-01-12 15:40:00,375][TRACE][index.store.deletes ] [node-5][logs_2003-10_performance_0][14] StoreDirectory.deleteFile: delete file _2.fdt
[2017-01-12 15:40:00,375][TRACE][transport.tracer ] [node-5] [1995649][indices:data/write/bulk[s][p]] received response from [{node-5}{IOKuMzJbRjesv8NInGiuBQ}{10.75.114.160}{10.75.114.160:9
305}{ips_id=6D46:6324, master=false}]
.......
2017-01-12 15:40:00,416][TRACE][indices.breaker.request ] [request] Adjusted breaker by [-16440] bytes, now [0]
[2017-01-12 15:40:00,417][TRACE][transport.tracer ] [node-5] [1994226][indices:data/write/bulk[s][p]] received response from [{node-5}{IOKuMzJbRjesv8NInGiuBQ}{10.75.114.160}{10.75.114.160:9
305}{ips_id=6D46:6324, master=false}]
[2017-01-12 15:40:00,417][TRACE][indices.breaker.request ] [request] Adjusted breaker by [16440] bytes, now [16440]
[2017-01-12 15:40:00,417][TRACE][transport.tracer ] [node-5] [2004520][indices:data/write/bulk[s]] sent response
[2017-01-12 15:40:00,417][TRACE][indices.breaker.request ] [request] Adjusted breaker by [-16440] bytes, now [0]
[2017-01-12 15:40:00,417][TRACE][transport.tracer ] [node-5] [1993906][indices:data/write/bulk[s][p]] received response from [{node-5}{IOKuMzJbRjesv8NInGiuBQ}{10.75.114.160}{10.75.114.160:9
305}{ips_id=6D46:6324, master=false}]
[2017-01-12 15:40:00,417][TRACE][indices.breaker.request ] [request] Adjusted breaker by [16440] bytes, now [16440]
[2017-01-12 15:40:00,417][TRACE][transport.tracer ] [node-5] [2001951][indices:data/write/bulk[s]] sent response
[2017-01-12 15:40:00,418][DEBUG][indices.memory ] [node-5] recalculating shard indexing buffer, total is [1.4gb] with [195] active shards, each shard set to indexing=[7.7mb], translog=[64
kb]
[2017-01-12 15:40:00,418][DEBUG][index.shard ] [node-5] [logs_2000-12_performance_0][2] updating index_buffer_size from [7.8mb] to [7.7mb]; IndexWriter now using [427204] bytes
[2017-01-12 15:40:00,418][DEBUG][index.shard ] [node-5] [logs_2000-12_performance_0][18] updating index_buffer_size from [7.8mb] to [7.7mb]; IndexWriter now using [431760] bytes
[2017-01-12 15:40:00,418][DEBUG][index.shard ] [node-5] [logs_2000-12_performance_0][26] updating index_buffer_size from [7.8mb] to [7.7mb]; IndexWriter now using [431760] bytes
[2017-01-12 15:40:00,418][DEBUG][index.shard ] [node-5] [logs_2000-12_performance_0][10] updating index_buffer_size from [7.8mb] to [7.7mb]; IndexWriter now using [430140] bytes
[2017-01-12 15:40:00,419][DEBUG][index.shard ] [node-5] [logs_2012-05_performance_0][24] updating index_buffer_size from [7.8mb] to [7.7mb]; IndexWriter now using [425584] bytes
[2017-01-12 15:40:00,419][TRACE][index.engine.lucene.iw ] [node-5] [logs_1998-01_performance_0][16] elasticsearch[node-5][refresh][T#7] DW: publishFlushedSegment seg-private updates=null
[2017-01-12 15:40:00,419][TRACE][index.engine.lucene.iw ] [node-5] [logs_1998-01_performance_0][16] elasticsearch[node-5][refresh][T#7] IW: publishFlushedSegment