Allow to update ttl field mapping after initial creation. Fixes #2136
Adding possibility to change TTL field mapper data without specifying enabled flag in mapping update
Merge pull request #2811 from spinscale/document-mapper-merge

Allow to update ttl field mapping after initial creation. Fixes #2136
Field Data: Simplify field data cache settings
closes #2843
fix seen readers counter
since clear can be called on percolator as well, we need to make sure we inc the counter even for non segment readers
Add support for creating a fedora RPM package with maven

Note: This has been disabled by default and is therefore not included in a
standard build. The main reason for this is, that you need to have a RPM
binary and the rpm development packages installed, which is not the case
on many systems.

The package contains an init.d-script as well as systemd configurations.

You can build your own RPM package simply by running 'maven rpm:rpm'
Merge pull request #2758 from spinscale/maven-rpm

Add support for creating a RPM package with maven
If no specified index or alias exists and `ignore_indices` is set to `missing` an index missing error is returned instead of resolving to all open indices (e.g. when searching). This breaks backwards comp. with 0.20.x and before.
Closes #2837
Fixed typo