- Elasticsearch 5.x Cookbook Third Edition
- Credits
- About the Author
- About the Reviewer
- www.PacktPub.com
- Customer Feedback
- Dedication
- Preface
- 1. Getting Started
- 2. Downloading and Setup
- Introduction
- Downloading and installing Elasticsearch
- Setting up networking
- Setting up a node
- Setting up for Linux systems
- Setting up different node types
- Setting up a client node
- Setting up an ingestion node
- Installing plugins in Elasticsearch
- Installing plugins manually
- Removing a plugin
- Changing logging settings
- Setting up a node via Docker
- 3. Managing Mappings
- Introduction
- Using explicit mapping creation
- Mapping base types
- Mapping arrays
- Mapping an object
- Mapping a document
- Using dynamic templates in document mapping
- Managing nested objects
- Managing child document
- Adding a field with multiple mapping
- Mapping a GeoPoint field
- Mapping a GeoShape field
- Mapping an IP field
- Mapping an attachment field
- Adding metadata to a mapping
- Specifying a different analyzer
- Mapping a completion field
- 4. Basic Operations
- Introduction
- Creating an index
- Deleting an index
- Opening/closing an index
- Putting a mapping in an index
- Getting a mapping
- Reindexing an index
- See also
- Refreshing an index
- Flushing an index
- ForceMerge an index
- Shrinking an index
- Checking if an index or type exists
- Managing index settings
- Using index aliases
- Rollover an index
- Indexing a document
- Getting a document
- Deleting a document
- Updating a document
- Speeding up atomic operations (bulk operations)
- Speeding up GET operations (multi GET)
- 5. Search
- Introduction
- Executing a search
- Sorting results
- Highlighting results
- Executing a scrolling query
- Using the search_after functionality
- Returning inner hits in results
- Suggesting a correct query
- Counting matched results
- Explaining a query
- Query profiling
- Deleting by query
- Updating by query
- Matching all the documents
- Using a boolean query
- 6. Text and Numeric Queries
- Introduction
- Using a term query
- Using a terms query
- Using a prefix query
- Using a wildcard query
- Using a regexp query
- Using span queries
- Using a match query
- Using a query string query
- Using a simple query string query
- Using the range query
- The common terms query
- Using IDs query
- Using the function score query
- Using the exists query
- Using the template query
- 7. Relationships and Geo Queries
- 8. Aggregations
- Introduction
- Executing an aggregation
- Executing stats aggregations
- Executing terms aggregation
- Executing significant terms aggregation
- Executing range aggregations
- Executing histogram aggregations
- Executing date histogram aggregations
- Executing filter aggregations
- Executing filters aggregations
- Executing global aggregations
- Executing geo distance aggregations
- Executing children aggregations
- Executing nested aggregations
- Executing top hit aggregations
- Executing a matrix stats aggregation
- Executing geo bounds aggregations
- Executing geo centroid aggregations
- 9. Scripting
- 10. Managing Clusters and Nodes
- 11. Backup and Restore
- 12. User Interfaces
- 13. Ingest
- 14. Java Integration
- Introduction
- Creating a standard Java HTTP client
- Creating an HTTP Elasticsearch client
- Creating a native client
- Managing indices with the native client
- Managing mappings
- Managing documents
- Managing bulk actions
- Building a query
- Executing a standard search
- Executing a search with aggregations
- Executing a scroll search
- 15. Scala Integration
- 16. Python Integration
- 17. Plugin Development
- 18. Big Data Integration
Standard logging settings work very well for general usage.
Changing the log level can be useful to check for bugs or understanding malfunctions due to bad configuration or strange plugin behaviors. A verbose log can be used from Elasticsearch community to cover problems.
If you need to debug your Elasticsearch server or change how the logging works (that is, remoting send events), you need to change the log4j2.properties parameters.
You need a working Elasticsearch installation as we described in the Downloading and installing Elasticsearch recipe and a simple text editor to change configuration files.
In the config directory in your Elasticsearch install directory, there is a log4j2.properties file, which controls the working settings.
The steps required for changing the logging settings are:
- To emit every kind of logging Elasticsearch has, you can change the current root level logging which is:
rootLogger.level = info
- This needs to be changed to the following:
rootLogger.level = debug
- Now, if you start Elasticsearch from command-line (with
bin/elasticsearch -f), you should see a lot of garbage:[2017-01-11T21:34:16,369][DEBUG][o.e.b.Seccomp] BSD RLIMIT_NPROC initialization successful[2017-01-11T21:34:16,377][DEBUG] [o.e.b.Seccomp] OS X seatbelt initialization successful [2017-01-11T21:34:16,404][DEBUG][o.e.b.JarHell] java.class.path: /usr/local/Cellar/elasticsearch/5.1.1/libexec/lib/elasticsearch- 5.1.1.jar:/usr/local/Cellar/elasticsearch/5.1.1/libexec/lib /elasticsearch5.1.1.jar:/usr/local/Cellar/elasticsearch/5.1.1/ libexec/lib/HdrHistogram2.1.6.jar:/usr/local/Cellar/ elasticsearch/5.1.1/libexec/lib/hppc-0.7.1.jar:/usr /local/Cellar/ ... (truncated)...
Elasticsearch logging system is based on the log4j library (http://logging.apache.org/log4j/).
Log4j is a powerful library to manage logging, covering all of its functionalities is outside the scope of this book. If a user needs advanced usage, there are a lot of books and articles on the Internet about it.
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