How to add all field values in a single field?

Hii.I am trying to create a new_field called "log_data" and I want to add each value in "log_data" field present in the message field.I want only one field with multiple values.How can I achieve this?

This are the documents:-

{
          "host" => "elk",
    "@timestamp" => 2021-09-13T11:43:11.742Z,
       "message" => "forrtl: error (78): process killed (SIGTERM)",
          "path" => "/root/matthew/rsl.error.0000",
      "@version" => "1"
}
{
          "host" => "elk",
    "@timestamp" => 2021-09-13T11:43:11.742Z,
       "message" => "wrf.exe            00000000033C6904  for__signal_handl     Unknown  Unknown",
          "path" => "/root/matthew/rsl.error.0000",
      "@version" => "1"
}

I want to created a field called "log_data" and put all values from "message" field in "log_data" field.Eg:-
I want document to look like this:-
{
     "host" => "elk",
     "log_data" => "wrf.exe            00000000033C6904  for__signal_handl     Unknown  Unknown","libmpi.so.40.20.2  0000149792ED14A0  ompi_request_defa     Unknown  Unknown"
}

Please Help

Are these two messages from a multiline log?
Then use the multiline codec in logstash or the multiline config in filebeat

Or are these actually two separate events?
If they are separate events then you should look into using the aggregate filter.

Hii @AquaX.Thanks for your reply.I have used multiline codec to parse this file,but I am not getting the desired output.This is my error log file.

**taskid: 1 hostname: gadi-cpu-clx-2197.gadi.nci.org.au**
 module_io_quilt_old.F        2931 F
Quilting with   1 groups of   0 I/O tasks.
 Ntasks in X           32 , ntasks in Y           36
WRF V4.1.2 MODEL
 *************************************
 Parent domain
 ids,ide,jds,jde            1         540           1         363
 ims,ime,jms,jme           11          41          -4          18
 ips,ipe,jps,jpe           18          34           1          11
 *************************************
DYNAMICS OPTION: Eulerian Mass Coordinate
 alloc_space_field: domain            1 ,               27827120  bytes allocated
 RESTART run: opening wrfrst_d01_1979-12-19_00:00:00 for reading
 Input data is acceptable to use:
Max map factor in domain 1 =  1.26. Scale the dt in the model accordingly.
 SOIL TEXTURE CLASSIFICATION = STAS FOUND          19  CATEGORIES
ThompMP: computing qr_acr_qg
ThompMP: computing qr_acr_qs
ThompMP: computing freezeH2O
 *************************************
 Nesting domain
 ids,ide,jds,jde            1         616           1         501
 ims,ime,jms,jme           11          50          -4          25
 ips,ipe,jps,jpe           21          40           1          14
 INTERMEDIATE domain
 ids,ide,jds,jde          203         331          88         193
 ims,ime,jms,jme          199         222          83         102
 ips,ipe,jps,jpe          209         212          86          92
 *************************************
 alloc_space_field: domain            2 ,                6245760  bytes allocated
 alloc_space_field: domain            2 ,               44879412  bytes allocated
 RESTART: nest, opening wrfrst_d02_1979-12-19_00:00:00 for reading
 Input data is acceptable to use:
 SOIL TEXTURE CLASSIFICATION = STAS FOUND          19  CATEGORIES
 Input data is acceptable to use:
Input data processed for aux input   4 for domain   1
 Input data is acceptable to use:
WRF restart, LBC starts at 1979-12-19_00:00:00 and restart starts at 1979-12-19_00:00:00
 LBC for restart: Starting valid date = 1979-12-19_00:00:00, Ending valid date = 1979-12-19_01:00:00
 LBC for restart: Restart time            = 1979-12-19_00:00:00
 LBC for restart: Found the correct bounding LBC time periods
 LBC for restart: Found the correct bounding LBC time periods for restart time = 1979-12-19_00:00:00
WRF NUMBER OF TILES FROM OMP_GET_MAX_THREADS =   1
 Tile Strategy is not specified. Assuming 1D-Y
WRF TILE   1 IS     18 IE     34 JS      1 JE     11
WRF NUMBER OF TILES =   1
 Input data is acceptable to use:
Input data processed for aux input   4 for domain   2
WRF NUMBER OF TILES FROM OMP_GET_MAX_THREADS =   1
 Tile Strategy is not specified. Assuming 1D-Y
WRF TILE   1 IS     21 IE     40 JS      1 JE     14
WRF NUMBER OF TILES =   1
 Input data is acceptable to use:
Input data processed for aux input   4 for domain   1
 Input data is acceptable to use:
 Input data is acceptable to use:
**forrtl: error (78): process killed (SIGTERM)**
**Image              PC                Routine            Line        Source             **
**wrf.exe            00000000033C6904  for__signal_handl     Unknown  Unknown**
**libpthread-2.28.s  000014BC5D449B20  Unknown               Unknown  Unknown**
**libuct.so.0.0.0    000014BC487376E4  uct_mm_iface_prog     Unknown  Unknown**
**libucp.so.0.0.0    000014BC4896B0EA  ucp_worker_progre     Unknown  Unknown**
**mca_pml_ucx.so     000014BC48DCC317  mca_pml_ucx_progr     Unknown  Unknown**

My goal is to write a logstash configuration pipeline that only extracts the first line i.e "taskid: 1 hostname: gadi-cpu-clx-2197.gadi.nci.org.au" and then it should extract the remaining data from this line till the end i.e "forrtl: error (78): process killed (SIGTERM)...." and so on

I have written a logstash configuration pipeline for doing this but it is taking all the data as a single line.This is my logstash configuration pipeline.

input {
      file {
            path => "/root/matthew/rsl.error.0001"
            start_position => "beginning"
            codec => multiline {
            charset => "UTF-8"
            pattern => "[a-zA-Z]+:\s+\d\s[a-zA-Z]+:\s+[a-zA-Z][a-zA-Z][a-zA-Z][a-zA-Z]-[a-zA-Z]+-[a-zA-Z]+-[0-9]+\.[a-zA-Z]+\.[a-zA-Z]+\.[a-zA-Z]+\.[a-zA-Z][a-zA-Z]*.\s[a-zA-Z]+:(\s+([a-zA-Z]+\s+)+)\(\d\d\):\s+([a-zA-Z]+( [a-zA-Z]+)+)\s+\([a-zA-Z]+\)\s([a-zA-Z]+( +[a-zA-Z]+)+)\.[a-zA-Z]+\s+([0-9]+([a-zA-Z]+[0-9]+)+)\s\s[a-zA-Z][a-zA-Z][a-zA-Z]__([a-zA-Z]+(_[a-zA-Z]+)+)(\s+([a-zA-Z]+\s+)+)[a-zA-Z]+([+-]?(?=\.\d|\d)(?:\d+)?(?:\.?\d*))(?:[eE]([+-]?\d+))?\.[a-zA-Z]\s\s([0-9]+([a-zA-Z]+[0-9]+)+)\s\s[a-zA-Z]+\s+[a-zA-Z]+\s+[a-zA-Z]+"
            negate => "true"
            what => "previous"
            auto_flush_interval => 5
            }
            sincedb_path => "/dev/null"
       }
}
output {
    stdout {}
}

Please provide me a regex pattern to achieve this