Cat api
provides statistics in tabular format.
GET _cat
Above
statement displays all the available options for cat api. Response like below.
=^.^=
/_cat/allocation
/_cat/shards
/_cat/shards/{index}
/_cat/master
/_cat/nodes
/_cat/indices
/_cat/indices/{index}
/_cat/segments
/_cat/segments/{index}
/_cat/count
/_cat/count/{index}
/_cat/recovery
/_cat/recovery/{index}
/_cat/health
/_cat/pending_tasks
/_cat/aliases
/_cat/aliases/{alias}
/_cat/thread_pool
/_cat/plugins
/_cat/fielddata
/_cat/fielddata/{fields}
1.To get shards information
GET
_cat/shards
Response
like below.
books 4 p STARTED 0 115b 172.16.0.3 sample_node books 4 r UNASSIGNED books 0 p STARTED 0 115b 172.16.0.3 sample_node books 0 r UNASSIGNED books 3 p STARTED 1 2.5kb 172.16.0.3 sample_node books 3 r UNASSIGNED books 1 p STARTED 0 115b 172.16.0.3 sample_node books 1 r UNASSIGNED books 2 p STARTED 1 2.5kb 172.16.0.3 sample_node books 2 r UNASSIGNED .marvel-2015.01.07 0 p STARTED 8922 26.2mb 172.16.0.3 sample_node .marvel-2015.01.07 0 r UNASSIGNED
To display
column headers use ‘?v’ parameter.
GET
_cat/shards?v
Response
like below.
index shard prirep state docs store ip node books 4 p STARTED 0 115b 172.16.0.3 sample_node books 4 r UNASSIGNED books 0 p STARTED 0 115b 172.16.0.3 sample_node books 0 r UNASSIGNED books 3 p STARTED 1 2.5kb 172.16.0.3 sample_node books 3 r UNASSIGNED books 1 p STARTED 0 115b 172.16.0.3 sample_node books 1 r UNASSIGNED books 2 p STARTED 1 2.5kb 172.16.0.3 sample_node books 2 r UNASSIGNED .marvel-2015.01.07 0 p STARTED 8957 27.2mb 172.16.0.3 sample_node .marvel-2015.01.07 0 r UNASSIGNED
2.To get cluster health
GET
_cat/health?v
Response
like below.
epoch timestamp cluster status node.total node.data shards pri relo init unassign 1420630100 16:58:20 cluster_sample yellow 1 1 6 6 0 0 6
3. To get information about nodes.
GET
_cat/nodes?v
Response
like below.
host ip heap.percent ram.percent load node.role master name RENT-MIS-LT3016 172.16.0.3 4 60 d * sample_node
4. You
can add help parameter at the end of cat endpoint to get more help on how to
use this endpoint with more options.
GET
_cat/nodes?help
id | id,nodeId | unique node id pid | p | process id host | h | host name ip | i | ip address port | po | bound transport port version | v | es version build | b | es build hash jdk | j | jdk version disk.avail | d,disk,diskAvail | available disk space heap.percent | hp,heapPercent | used heap ratio heap.max | hm,heapMax | max configured heap ram.percent | rp,ramPercent | used machine memory ratio ram.max | rm,ramMax | total machine memory load | l | most recent load avg uptime | u | node uptime node.role | r,role,dc,nodeRole | d:data node, c:client node master | m | m:master-eligible, *:current master name | n | node name completion.size | cs,completionSize | size of completion fielddata.memory_size | fm,fielddataMemory | used fielddata cache fielddata.evictions | fe,fielddataEvictions | fielddata evictions filter_cache.memory_size | fcm,filterCacheMemory | used filter cache filter_cache.evictions | fce,filterCacheEvictions | filter cache evictions query_cache.memory_size | qcm,queryCacheMemory | used query cache query_cache.evictions | qce,queryCacheEvictions | query cache evictions query_cache.hit_count | qchc,queryCacheHitCount | query cache hit counts query_cache.miss_count | qcmc,queryCacheMissCount | query cache miss counts flush.total | ft,flushTotal | number of flushes flush.total_time | ftt,flushTotalTime | time spent in flush get.current | gc,getCurrent | number of current get ops get.time | gti,getTime | time spent in get get.total | gto,getTotal | number of get ops get.exists_time | geti,getExistsTime | time spent in successful gets get.exists_total | geto,getExistsTotal | number of successful gets get.missing_time | gmti,getMissingTime | time spent in failed gets get.missing_total | gmto,getMissingTotal | number of failed gets id_cache.memory_size | im,idCacheMemory | used id cache indexing.delete_current | idc,indexingDeleteCurrent | number of current deletions indexing.delete_time | idti,indexingDeleteTime | time spent in deletions indexing.delete_total | idto,indexingDeleteTotal | number of delete ops indexing.index_current | iic,indexingIndexCurrent | number of current indexing ops indexing.index_time | iiti,indexingIndexTime | time spent in indexing indexing.index_total | iito,indexingIndexTotal | number of indexing ops merges.current | mc,mergesCurrent | number of current merges merges.current_docs | mcd,mergesCurrentDocs | number of current merging docs merges.current_size | mcs,mergesCurrentSize | size of current merges merges.total | mt,mergesTotal | number of completed merge ops merges.total_docs | mtd,mergesTotalDocs | docs merged merges.total_size | mts,mergesTotalSize | size merged merges.total_time | mtt,mergesTotalTime | time spent in merges percolate.current | pc,percolateCurrent | number of current percolations percolate.memory_size | pm,percolateMemory | memory used by percolations percolate.queries | pq,percolateQueries | number of registered percolation queries percolate.time | pti,percolateTime | time spent percolating percolate.total | pto,percolateTotal | total percolations refresh.total | rto,refreshTotal | total refreshes refresh.time | rti,refreshTime | time spent in refreshes search.fetch_current | sfc,searchFetchCurrent | current fetch phase ops search.fetch_time | sfti,searchFetchTime | time spent in fetch phase search.fetch_total | sfto,searchFetchTotal | total fetch ops search.open_contexts | so,searchOpenContexts | open search contexts search.query_current | sqc,searchQueryCurrent | current query phase ops search.query_time | sqti,searchQueryTime | time spent in query phase search.query_total | sqto,searchQueryTotal | total query phase ops segments.count | sc,segmentsCount | number of segments segments.memory | sm,segmentsMemory | memory used by segments segments.index_writer_memory | siwm,segmentsIndexWriterMemory | memory used by index writer segments.index_writer_max_memory | siwmx,segmentsIndexWriterMaxMemory | maximum memory index writer may use before it must write buffered documents to a new segment segments.version_map_memory | svmm,segmentsVersionMapMemory | memory used by version map segments.fixed_bitset_memory | sfbm,fixedBitsetMemory | memory used by fixed bit sets for nested object field types and type filters for types referred in _parent fields suggest.current | suc,suggestCurrent | number of current suggest ops suggest.time | suti,suggestTime | time spend in suggest suggest.total | suto,suggestTotal | number of suggest ops
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